llvmPackages: don't exclude FreeBSD from -lunwind

The exception for FreeBSD was added in 0afe9d1f70 ("freebsd packages:
Init at 13.1"), but it seems to have been erroneous, as e.g. ncurses
fails to build:

	x86_64-unknown-freebsd13-clang++  -o demo ../obj_s/demo.o -L../lib -lncurses++w -L../lib -lformw -lmenuw -lpanelw -lncursesw   -lutil     -DHAVE_CONFIG_H -DBUILDING_NCURSES_CXX -I../c++ -I. -I../include  -DNDEBUG -O2  -fPIC -DPIC
	x86_64-unknown-freebsd13-ld: error: undefined symbol: _Unwind_Resume
	>>> referenced by demo.cc
	>>>               ../obj_s/demo.o:(TestApplication::run())
	>>> referenced by demo.cc
	>>>               ../obj_s/demo.o:(_GLOBAL__sub_I_demo.cc)
	>>> referenced by demo.cc
	>>>               ../obj_s/demo.o:(NCursesUserItem<UserData>::NCursesUserItem(char const*, char const*, UserData const*))
	>>> referenced 46 more times
	clang-12: error: linker command failed with exit code 1 (use -v to see invocation)

This is fixed by undoing the change, adding -lunwind on FreeBSD.

pkgs/development/compilers/llvm/10/default.nix

@@ -157,7 +157,7 @@ let
         echo "-B${targetLlvmLibraries.compiler-rt}/lib" >> $out/nix-support/cc-cflags
       '' + lib.optionalString (!stdenv.targetPlatform.isWasm) ''
         echo "--unwindlib=libunwind" >> $out/nix-support/cc-cflags
-      '' + lib.optionalString (!stdenv.targetPlatform.isWasm && !stdenv.targetPlatform.isFreeBSD && stdenv.targetPlatform.useLLVM or false) ''
+      '' + lib.optionalString (!stdenv.targetPlatform.isWasm && stdenv.targetPlatform.useLLVM or false) ''
         echo "-lunwind" >> $out/nix-support/cc-ldflags
       '' + lib.optionalString stdenv.targetPlatform.isWasm ''
         echo "-fno-exceptions" >> $out/nix-support/cc-cflags

pkgs/development/compilers/llvm/11/default.nix

@@ -172,7 +172,7 @@ let
         echo "-B${targetLlvmLibraries.compiler-rt}/lib" >> $out/nix-support/cc-cflags
       '' + lib.optionalString (!stdenv.targetPlatform.isWasm) ''
         echo "--unwindlib=libunwind" >> $out/nix-support/cc-cflags
-      '' + lib.optionalString (!stdenv.targetPlatform.isWasm && !stdenv.targetPlatform.isFreeBSD && stdenv.targetPlatform.useLLVM or false) ''
+      '' + lib.optionalString (!stdenv.targetPlatform.isWasm && stdenv.targetPlatform.useLLVM or false) ''
         echo "-lunwind" >> $out/nix-support/cc-ldflags
       '' + lib.optionalString stdenv.targetPlatform.isWasm ''
         echo "-fno-exceptions" >> $out/nix-support/cc-cflags

pkgs/development/compilers/llvm/12/default.nix

@@ -164,7 +164,7 @@ let
         echo "-B${targetLlvmLibraries.compiler-rt}/lib" >> $out/nix-support/cc-cflags
       '' + lib.optionalString (!stdenv.targetPlatform.isWasm) ''
         echo "--unwindlib=libunwind" >> $out/nix-support/cc-cflags
-      '' + lib.optionalString (!stdenv.targetPlatform.isWasm && !stdenv.targetPlatform.isFreeBSD && stdenv.targetPlatform.useLLVM or false) ''
+      '' + lib.optionalString (!stdenv.targetPlatform.isWasm && stdenv.targetPlatform.useLLVM or false) ''
         echo "-lunwind" >> $out/nix-support/cc-ldflags
       '' + lib.optionalString stdenv.targetPlatform.isWasm ''
         echo "-fno-exceptions" >> $out/nix-support/cc-cflags

pkgs/development/compilers/llvm/13/default.nix

@@ -164,7 +164,7 @@ let
         echo "-B${targetLlvmLibraries.compiler-rt}/lib" >> $out/nix-support/cc-cflags
       '' + lib.optionalString (!stdenv.targetPlatform.isWasm) ''
         echo "--unwindlib=libunwind" >> $out/nix-support/cc-cflags
-      '' + lib.optionalString (!stdenv.targetPlatform.isWasm && !stdenv.targetPlatform.isFreeBSD && stdenv.targetPlatform.useLLVM or false) ''
+      '' + lib.optionalString (!stdenv.targetPlatform.isWasm && stdenv.targetPlatform.useLLVM or false) ''
         echo "-lunwind" >> $out/nix-support/cc-ldflags
       '' + lib.optionalString stdenv.targetPlatform.isWasm ''
         echo "-fno-exceptions" >> $out/nix-support/cc-cflags

pkgs/development/compilers/llvm/14/default.nix

@@ -167,7 +167,7 @@ let
         ]
         ++ lib.optional (!stdenv.targetPlatform.isWasm) "--unwindlib=libunwind"
         ++ lib.optional
-          (!stdenv.targetPlatform.isWasm && !stdenv.targetPlatform.isFreeBSD && stdenv.targetPlatform.useLLVM or false)
+          (!stdenv.targetPlatform.isWasm && stdenv.targetPlatform.useLLVM or false)
           "-lunwind"
         ++ lib.optional stdenv.targetPlatform.isWasm "-fno-exceptions";
     };

pkgs/development/compilers/llvm/7/default.nix

@@ -164,7 +164,7 @@ let
         echo "-B${targetLlvmLibraries.compiler-rt}/lib" >> $out/nix-support/cc-cflags
       '' + lib.optionalString (!stdenv.targetPlatform.isWasm) ''
         echo "--unwindlib=libunwind" >> $out/nix-support/cc-cflags
-      '' + lib.optionalString (!stdenv.targetPlatform.isWasm && !stdenv.targetPlatform.isFreeBSD && stdenv.targetPlatform.useLLVM or false) ''
+      '' + lib.optionalString (!stdenv.targetPlatform.isWasm && stdenv.targetPlatform.useLLVM or false) ''
         echo "-lunwind" >> $out/nix-support/cc-ldflags
       '' + lib.optionalString stdenv.targetPlatform.isWasm ''
         echo "-fno-exceptions" >> $out/nix-support/cc-cflags

pkgs/development/compilers/llvm/8/default.nix

@@ -165,7 +165,7 @@ let
         echo "-B${targetLlvmLibraries.compiler-rt}/lib" >> $out/nix-support/cc-cflags
       '' + lib.optionalString (!stdenv.targetPlatform.isWasm) ''
         echo "--unwindlib=libunwind" >> $out/nix-support/cc-cflags
-      '' + lib.optionalString (!stdenv.targetPlatform.isWasm && !stdenv.targetPlatform.isFreeBSD && stdenv.targetPlatform.useLLVM or false) ''
+      '' + lib.optionalString (!stdenv.targetPlatform.isWasm && stdenv.targetPlatform.useLLVM or false) ''
         echo "-lunwind" >> $out/nix-support/cc-ldflags
       '' + lib.optionalString stdenv.targetPlatform.isWasm ''
         echo "-fno-exceptions" >> $out/nix-support/cc-cflags

pkgs/development/compilers/llvm/9/default.nix

@@ -165,7 +165,7 @@ let
         echo "-B${targetLlvmLibraries.compiler-rt}/lib" >> $out/nix-support/cc-cflags
       '' + lib.optionalString (!stdenv.targetPlatform.isWasm) ''
         echo "--unwindlib=libunwind" >> $out/nix-support/cc-cflags
-      '' + lib.optionalString (!stdenv.targetPlatform.isWasm && !stdenv.targetPlatform.isFreeBSD && stdenv.targetPlatform.useLLVM or false) ''
+      '' + lib.optionalString (!stdenv.targetPlatform.isWasm && stdenv.targetPlatform.useLLVM or false) ''
         echo "-lunwind" >> $out/nix-support/cc-ldflags
       '' + lib.optionalString stdenv.targetPlatform.isWasm ''
         echo "-fno-exceptions" >> $out/nix-support/cc-cflags

pkgs/development/compilers/llvm/git/default.nix

@@ -166,7 +166,7 @@ let
         ]
         ++ lib.optional (!stdenv.targetPlatform.isWasm) "--unwindlib=libunwind"
         ++ lib.optional
-          (!stdenv.targetPlatform.isWasm && !stdenv.targetPlatform.isFreeBSD && stdenv.targetPlatform.useLLVM or false)
+          (!stdenv.targetPlatform.isWasm && stdenv.targetPlatform.useLLVM or false)
           "-lunwind"
         ++ lib.optional stdenv.targetPlatform.isWasm "-fno-exceptions";
     };