spirv-cross: change shared build targets

Build shared targets for macOS as well. The reason for this is that, for
example, the `sdl3-shadercross` library depends on these shared
libraries to be available. Without this change `sdl3-shadercross` can
not support darwin targets.

pkgs/by-name/sp/spirv-cross/package.nix

@@ -22,7 +22,7 @@ stdenv.mkDerivation (finalAttrs: {
     python3
   ];
 
-  cmakeFlags = lib.optionals stdenv.hostPlatform.isLinux [
+  cmakeFlags = lib.optionals stdenv.hostPlatform.isUnix [
     (lib.cmakeBool "SPIRV_CROSS_SHARED" true)
   ];