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/misc/vc4/newlib.nix

@@ -0,0 +1,28 @@
+{ stdenv, texinfo, flex, bison, fetchFromGitHub, crossLibcStdenv, buildPackages }:
+
+crossLibcStdenv.mkDerivation {
+  name = "newlib";
+  src = fetchFromGitHub {
+    owner = "itszor";
+    repo = "newlib-vc4";
+    rev = "89abe4a5263d216e923fbbc80495743ff269a510";
+    sha256 = "131r4v0nn68flnqibjcvhsrys3hs89bn0i4vwmrzgjd7v1rbgqav";
+  };
+  dontUpdateAutotoolsGnuConfigScripts = true;
+  configurePlatforms = [ "target" ];
+  enableParallelBuilding = true;
+
+  nativeBuildInputs = [ texinfo flex bison ];
+  depsBuildBuild = [ buildPackages.stdenv.cc ];
+  # newlib expects CC to build for build platform, not host platform
+  preConfigure = ''
+    export CC=cc
+  '';
+
+  dontStrip = true;
+
+  passthru = {
+    incdir = "/${stdenv.targetPlatform.config}/include";
+    libdir = "/${stdenv.targetPlatform.config}/lib";
+  };
+}