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/boehm-gc/mcfgthread.patch

@@ -0,0 +1,11 @@
+--- a/configure.ac
++++ b/configure.ac
+@@ -277,7 +277,7 @@ case "$THREADS" in
+         ;;
+     esac
+     ;;
+- win32)
++ win32 | mcf)
+     AC_DEFINE(GC_THREADS)
+     use_parallel_mark=$enable_parallel_mark
+     if test "${enable_parallel_mark}" != no \