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/games/zandronum/dont_update_gitinfo.patch

@@ -0,0 +1,19 @@
+diff -r dd3c3b57023f src/CMakeLists.txt
+--- a/src/CMakeLists.txt	Fri Sep 01 06:40:50 2017 -0500
++++ b/src/CMakeLists.txt	Fri Sep 15 01:46:34 2017 -0700
+@@ -636,15 +636,6 @@
+	add_definitions( -DBACKPATCH )
+ endif( BACKPATCH )
+
+-# Update gitinfo.h
+-
+-get_target_property( UPDATEREVISION_EXE updaterevision LOCATION )
+-
+-add_custom_target( revision_check ALL
+-	COMMAND ${UPDATEREVISION_EXE} src/gitinfo.h
+-	WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
+-	DEPENDS updaterevision )
+-
+ # Libraries ZDoom needs
+
+ message( STATUS "Fluid synth libs: ${FLUIDSYNTH_LIBRARIES}" )