edk2 add short-circuit-the-transfer-of-an-empty-S3_CONTEXT.patch

as requested by @lukeadams in
https://github.com/NixOS/nixpkgs/pull/32724#issuecomment-352140119

pkgs/development/compilers/edk2/default.nix

···
-{ stdenv, fetchFromGitHub, libuuid, python2, iasl }:
+{ stdenv, fetchFromGitHub, fetchpatch, libuuid, python2, iasl }:
 
 let
   pythonEnv = python2.withPackages(ps: [ps.tkinter]);
···
     sha256 = "0k48xfwxcgcim1bhkggc19hilvsxsf5axvvcpmld0ng1fcfg0cr6";
   };
 
-  buildInputs = [ libuuid pythonEnv];
+  patches = [
+    (fetchpatch {
+      name = "short-circuit-the-transfer-of-an-empty-S3_CONTEXT.patch";
+      url = "https://github.com/tianocore/edk2/commit/9e2a8e928995c3b1bb664b73fd59785055c6b5f6";
+      sha256 = "0mdqa9w1p6cmli6976v4wi0sw9r4p5prkj7lzfd1877wk11c9c73";
+    })
+  ];
+
+  buildInputs = [ libuuid pythonEnv ];
 
   makeFlags = "-C BaseTools";
 
···
     mv -v EdkCompatibilityPkg $out
     mv -v edksetup.sh $out
   '';
+
+  enableParallelBuilding = true;
 
   meta = {
     description = "Intel EFI development kit";