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/gflags/default.nix

@@ -0,0 +1,40 @@
+{ lib, stdenv, fetchFromGitHub, cmake
+, enableShared ? !stdenv.hostPlatform.isStatic
+}:
+
+stdenv.mkDerivation rec {
+  pname = "gflags";
+  version = "2.2.2";
+
+  src = fetchFromGitHub {
+    owner = "gflags";
+    repo = "gflags";
+    rev = "v${version}";
+    sha256 = "147i3md3nxkjlrccqg4mq1kyzc7yrhvqv5902iibc7znkvzdvlp0";
+  };
+
+  nativeBuildInputs = [ cmake ];
+
+  # This isn't used by the build and breaks the CMake build on case-insensitive filesystems (e.g., on Darwin)
+  preConfigure = "rm BUILD";
+
+  cmakeFlags = [
+    "-DGFLAGS_BUILD_SHARED_LIBS=${if enableShared then "ON" else "OFF"}"
+    "-DGFLAGS_BUILD_STATIC_LIBS=ON"
+  ];
+
+  doCheck = false;
+
+  meta = with lib; {
+    description = "A C++ library that implements commandline flags processing";
+    longDescription = ''
+      The gflags package contains a C++ library that implements commandline flags processing.
+      As such it's a replacement for getopt().
+      It was owned by Google. google-gflags project has been renamed to gflags and maintained by new community.
+    '';
+    homepage = "https://gflags.github.io/gflags/";
+    license = licenses.bsd3;
+    maintainers = [ maintainers.linquize ];
+    platforms = platforms.all;
+  };
+}