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/misc/empty/0.6-Makefile.patch

@@ -0,0 +1,13 @@
+diff --git a/Makefile b/Makefile
+index 1fe4c41..2c69558 100644
+--- a/Makefile
++++ b/Makefile
+@@ -16,7 +16,7 @@ LIBS =	-lutil
+ PREFIX = /usr/local
+ 
+ all:
+-	${CC} ${CFLAGS} -Wall ${LIBS} -o empty empty.c
++	${CC} ${CFLAGS} -Wall -o empty empty.c ${LIBS}
+ 
+ FreeBSD:	all
+ NetBSD:		all