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/tools/X11/xpra/nvenc.pc

@@ -0,0 +1,11 @@
+prefix=@out@
+includedir=${prefix}/include
+libdir=@nvidia_x11@/lib
+
+Name: nvenc
+Description: NVENC
+Version: 10
+Requires:
+Conflicts:
+Libs: -L${libdir} -lnvidia-encode
+Cflags: -I${includedir}