Merge pull request #245563 from flokli/fix-jsonnet-darwin

jsonnet: fix build on darwin

pkgs/development/compilers/jsonnet/default.nix

···
   cmakeFlags = [
     "-DUSE_SYSTEM_GTEST=ON"
     "-DBUILD_STATIC_LIBS=${if stdenv.hostPlatform.isStatic then "ON" else "OFF"}"
+  ] ++ lib.optionals (!stdenv.isDarwin) [
     "-DBUILD_SHARED_BINARIES=${if stdenv.hostPlatform.isStatic then "OFF" else "ON"}"
   ];