ghostscript: fix install names on Darwin

Fixes NixOS#355377.

This should avoid the need to mess around with `install_name_tool`
entirely. This mirrors what is done by Homebrew[^1] and MacPorts[^2].

This should also make the changes in NixOS#355853 and NixOS#357951 unnecessary.

[^1]: https://github.com/Homebrew/homebrew-core/blob/5ca4f8ce766c69d49321fb7da1d297b8232f40cf/Formula/g/ghostscript.rb#L76
[^2]: https://github.com/macports/macports-ports/blob/d8a05520fa6a81fa5b0365068590aff184976b69/print/ghostscript/Portfile#L114

(cherry picked from commit 8b3d3d5)

pkgs/misc/ghostscript/default.nix

@@ -104,6 +104,8 @@ stdenv.mkDerivation rec {
     sed "s@^ZLIBDIR=.*@ZLIBDIR=${zlib.dev}/include@" -i configure.ac
 
     autoconf
+  '' + lib.optionalString stdenv.hostPlatform.isDarwin ''
+    export DARWIN_LDFLAGS_SO_PREFIX=$out/lib/
   '';
 
   configureFlags = [
@@ -140,13 +142,6 @@ stdenv.mkDerivation rec {
     done
   '';
 
-  # dynamic library name only contains maj.min, eg. '9.53'
-  dylib_version = lib.versions.majorMinor version;
-  preFixup = lib.optionalString stdenv.isDarwin ''
-    install_name_tool -change libgs.dylib.$dylib_version $out/lib/libgs.dylib.$dylib_version $out/bin/gs
-    install_name_tool -change libgs.dylib.$dylib_version $out/lib/libgs.dylib.$dylib_version $out/bin/gsx
-  '';
-
   # validate dynamic linkage
   doInstallCheck = true;
   installCheckPhase = ''