uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/development/libraries/libx86emu/default.nix

@@ -0,0 +1,35 @@
+{ lib, stdenv, fetchFromGitHub, perl }:
+
+stdenv.mkDerivation rec {
+  pname = "libx86emu";
+  version = "3.5";
+
+  src = fetchFromGitHub {
+    owner = "wfeldt";
+    repo = "libx86emu";
+    rev = version;
+    sha256 = "sha256-dKT/Ey+vardXu/+coaC69TTUXjJLsLBKgCx9VY8f0oY=";
+  };
+
+  nativeBuildInputs = [ perl ];
+
+  postUnpack = "rm $sourceRoot/git2log";
+  patchPhase = ''
+    # VERSION is usually generated using Git
+    echo "${version}" > VERSION
+    substituteInPlace Makefile --replace "/usr" "/"
+  '';
+
+  buildFlags = [ "shared" ];
+  enableParallelBuilding = true;
+
+  installFlags = [ "DESTDIR=$(out)" "LIBDIR=/lib" ];
+
+  meta = with lib; {
+    description = "x86 emulation library";
+    license = licenses.bsd2;
+    homepage = "https://github.com/wfeldt/libx86emu";
+    maintainers = with maintainers; [ bobvanderlinden ];
+    platforms = platforms.linux;
+  };
+}