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/elpa/pkg-config.patch

@@ -0,0 +1,13 @@
+diff --git a/configure.ac b/configure.ac
+index 0aa533a..da5d1f7 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -2336,7 +2336,7 @@ if test x"$have_loop_blocking" = x"yes"; then
+ fi
+ 
+ AC_SUBST([SUFFIX])
+-AC_SUBST([PKG_CONFIG_FILE],[elpa${SUFFIX}.pc])
++AC_SUBST([PKG_CONFIG_FILE],[elpa.pc])
+ 
+ AC_CONFIG_FILES([
+   Makefile