binutils: fix windres not finding the apprioate cross compiler

pkgs/development/tools/misc/binutils/default.nix

@@ -94,7 +94,8 @@ stdenv.mkDerivation {
        # indeed GHC will refuse to compile with a binutils suffering from it. See
        # this comment for more information:
        # https://gitlab.haskell.org/ghc/ghc/issues/4210#note_78333
-       lib.optional (stdenv.targetPlatform.isAarch32 && stdenv.hostPlatform.system != stdenv.targetPlatform.system) ./R_ARM_COPY.patch;
+       lib.optional (stdenv.targetPlatform.isAarch32 && stdenv.hostPlatform.system != stdenv.targetPlatform.system) ./R_ARM_COPY.patch
+    ++ lib.optional stdenv.targetPlatform.isWindows ./windres-locate-gcc.patch;
 
   outputs = [ "out" "info" "man" ];
 

pkgs/development/tools/misc/binutils/windres-locate-gcc.patch

@@ -0,0 +1,19 @@
+diff --git a/binutils/resrc.c b/binutils/resrc.c
+index a875c3a4..0411d047 100644
+--- a/binutils/resrc.c
++++ b/binutils/resrc.c
+@@ -521,7 +521,13 @@ read_rc_file (const char *filename, const char *preprocessor,
+ 
+       cpp_pipe = 0;
+ 
+-      if (dash)
++      /* Nixpkgs specific : look first at the prefixed path
++        ( there should be no gcc in the binutils folder ) */
++      if (slash && dash) {
++        cpp_pipe = look_for_default(cmd, slash + 1, dash - slash, preprocargs, filename);
++      }
++
++      if (dash && ! cpp_pipe)
+ 	{
+ 	  /* First, try looking for a prefixed gcc in the windres
+ 	     directory, with the same prefix as windres */