zls: fix build on Darwin

pkgs/by-name/zl/zls/package.nix

@@ -3,6 +3,7 @@
 , fetchFromGitHub
 , zig_0_13
 , callPackage
+, apple-sdk_11,
 }:
 
 stdenv.mkDerivation (finalAttrs: {
@@ -23,6 +24,8 @@ stdenv.mkDerivation (finalAttrs: {
 
   nativeBuildInputs = [ zig_0_13.hook ];
 
+  buildInputs = lib.optionals stdenv.hostPlatform.isDarwin [ apple-sdk_11 ];
+
   postPatch = ''
     ln -s ${callPackage ./deps.nix { }} $ZIG_GLOBAL_CACHE_DIR/p
   '';