buildRustCrate: extensions.sharedLibrary -> extensions.library

Switched to a common attribute for library file extensions:
de70971c90

This makes buildRustCrate evaluate successfully when using
pkgsCross/pkgsStatic.

pkgs/build-support/rust/build-rust-crate/build-crate.nix

@@ -51,7 +51,7 @@
     # configure & source common build functions
     LIB_RUSTC_OPTS="${libRustcOpts}"
     BIN_RUSTC_OPTS="${binRustcOpts}"
-    LIB_EXT="${stdenv.hostPlatform.extensions.sharedLibrary or ""}"
+    LIB_EXT="${stdenv.hostPlatform.extensions.library}"
     LIB_PATH="${libPath}"
     LIB_NAME="${libName}"
 

pkgs/build-support/rust/build-rust-crate/default.nix

@@ -49,7 +49,7 @@ let
           filename =
             if lib.any (x: x == "lib" || x == "rlib") dep.crateType
             then "${dep.metadata}.rlib"
-            else "${dep.metadata}${stdenv.hostPlatform.extensions.sharedLibrary}";
+            else "${dep.metadata}${stdenv.hostPlatform.extensions.library}";
         in
         " --extern ${opts}${name}=${dep.lib}/lib/lib${extern}-${filename}"
       )

pkgs/build-support/rust/build-rust-crate/install-crate.nix

@@ -41,7 +41,7 @@ if !buildTests then ''
   fi
   if [ -e target/lib ]; then
     find target/lib/ -type f \! -name '*.rlib' \
-      -a \! -name '*${stdenv.hostPlatform.extensions.sharedLibrary}' \
+      -a \! -name '*${stdenv.hostPlatform.extensions.library}' \
       -a \! -name '*.d' \
       -executable \
       -print0 | xargs --no-run-if-empty --null install --target $out/tests;

pkgs/build-support/rust/build-rust-crate/test/default.nix

@@ -479,7 +479,7 @@ let
             # `-undefined dynamic_lookup` as otherwise the compilation fails.
             $CC -shared \
               ${lib.optionalString stdenv.isDarwin "-undefined dynamic_lookup"} \
-              -o $out/lib/${name}${stdenv.hostPlatform.extensions.sharedLibrary} ${src}
+              -o $out/lib/${name}${stdenv.hostPlatform.extensions.library} ${src}
           '';
           b = compile "libb" ''
             #include <stdio.h>