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/os-specific/linux/kernel-headers/no-relocs.patch

@@ -0,0 +1,7 @@
+--- a/arch/x86/Makefile
++++ b/arch/x86/Makefile
+@@ -231,3 +231,3 @@ endif
+ archscripts: scripts_basic
+-	$(Q)$(MAKE) $(build)=arch/x86/tools relocs
++	$(Q)$(MAKE) $(build)=arch/x86/tools
+