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/mesa/stubs.nix

@@ -0,0 +1,75 @@
+{ stdenv
+, libglvnd, mesa
+, OpenGL }:
+
+stdenv.mkDerivation {
+  inherit (libglvnd) version;
+  pname = "libGL";
+  outputs = [ "out" "dev" ];
+
+  # On macOS, libglvnd is not supported, so we just use what mesa
+  # build. We need to also include OpenGL.framework, and some
+  # extra tricks to go along with. We add mesa’s libGLX to support
+  # the X extensions to OpenGL.
+  buildCommand = if stdenv.hostPlatform.isDarwin then ''
+    mkdir -p $out/nix-support $dev
+    echo ${OpenGL} >> $out/nix-support/propagated-build-inputs
+    ln -s ${mesa.out}/lib $out/lib
+
+    mkdir -p $dev/lib/pkgconfig $dev/nix-support
+    echo "$out" > $dev/nix-support/propagated-build-inputs
+    ln -s ${mesa.dev}/include $dev/include
+
+    cat <<EOF >$dev/lib/pkgconfig/gl.pc
+  Name: gl
+  Description: gl library
+  Version: ${mesa.version}
+  Libs: -L${mesa.out}/lib -lGL
+  Cflags: -I${mesa.dev}/include
+  EOF
+
+    cat <<EOF >$dev/lib/pkgconfig/glesv1_cm.pc
+  Name: glesv1_cm
+  Description: glesv1_cm library
+  Version: ${mesa.version}
+  Libs: -L${mesa.out}/lib -lGLESv1_CM
+  Cflags: -I${mesa.dev}/include
+  EOF
+
+    cat <<EOF >$dev/lib/pkgconfig/glesv2.pc
+  Name: glesv2
+  Description: glesv2 library
+  Version: ${mesa.version}
+  Libs: -L${mesa.out}/lib -lGLESv2
+  Cflags: -I${mesa.dev}/include
+  EOF
+  ''
+
+  # Otherwise, setup gl stubs to use libglvnd.
+  else ''
+    mkdir -p $out/nix-support
+    ln -s ${libglvnd.out}/lib $out/lib
+
+    mkdir -p $dev/{,lib/pkgconfig,nix-support}
+    echo "$out ${libglvnd} ${libglvnd.dev}" > $dev/nix-support/propagated-build-inputs
+    ln -s ${libglvnd.dev}/include $dev/include
+
+    genPkgConfig() {
+      local name="$1"
+      local lib="$2"
+
+      cat <<EOF >$dev/lib/pkgconfig/$name.pc
+    Name: $name
+    Description: $lib library
+    Version: ${libglvnd.version}
+    Libs: -L${libglvnd.out}/lib -l$lib
+    Cflags: -I${libglvnd.dev}/include
+    EOF
+    }
+
+    genPkgConfig gl GL
+    genPkgConfig egl EGL
+    genPkgConfig glesv1_cm GLESv1_CM
+    genPkgConfig glesv2 GLESv2
+  '';
+}