bonsai: remove aarch64-specific hacks

they aren't needed with newer hare

pkgs/additional/bonsai/0001-cross-compile.patch

@@ -1,12 +0,0 @@
-diff --git a/Makefile b/Makefile
-index 4447137..6c2cebf 100644
---- a/Makefile
-+++ b/Makefile
-@@ -1,7 +1,6 @@
- .POSIX:
- .SUFFIXES:
- HARE=hare
--HAREFLAGS=
- SCDOC=scdoc
- 
- DESTDIR=

pkgs/additional/bonsai/default.nix

@@ -18,14 +18,6 @@ stdenv.mkDerivation rec {
     hash = "sha256-jOtFUpl2/Aa7f8JMZf6g63ayFOi+Ci+i7Ac63k63znc=";
   };
 
-  patches = [
-    ./0001-cross-compile.patch
-  ];
-
-  postPatch = lib.optionalString stdenv.isAarch64 ''
-    sed -i 's/hare build/hare build -t aarch64/g' Makefile
-  '';
-
   nativeBuildInputs = [
     hare
     hare-ev