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/tools/build-managers/kati/version.patch

@@ -0,0 +1,19 @@
+diff --git a/Makefile.ckati b/Makefile.ckati
+index e4067bb..15518f3 100644
+--- a/Makefile.ckati
++++ b/Makefile.ckati
+@@ -102,14 +102,8 @@ $(KATI_CXX_TEST_EXES): $(KATI_BIN_PATH)/%: $(KATI_INTERMEDIATES_PATH)/%.o
+ 	$(KATI_LD) $^ -o $@ $(KATI_LIBS)
+ 
+ # Rule to generate version.cc
+-KATI_GIT_DIR := $(shell git -C $(KATI_SRC_PATH) rev-parse --show-toplevel)
+-ifneq ($(KATI_GIT_DIR),)
+-KATI_VERSION_DEPS := $(KATI_GIT_DIR)/.git/HEAD $(KATI_GIT_DIR)/.git/index
+-KATI_VERSION := $(shell git -C $(KATI_GIT_DIR) rev-parse HEAD)
+-else
+ KATI_VERSION_DEPS :=
+ KATI_VERSION := unknown
+-endif
+ $(KATI_INTERMEDIATES_PATH)/version.cc: $(KATI_VERSION_DEPS)
+ 	@mkdir -p $(dir $@)
+ 	echo '// +build ignore' > $@