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/cd-dvd/srt-to-vtt-cl/fix-validation.patch

@@ -0,0 +1,13 @@
+--- a/Makefile
++++ b/Makefile
+@@ -1,9 +1,4 @@
+-ERR = $(shell which clang++ >/dev/null; echo $$?)
+-ifeq "$(ERR)" "0"
+-	CXX ?= clang++
+-else
+-	CXX ?= g++
+-endif
++CXX ?= g++
+ CXXFLAGS = -std=c++11 -O2 -MMD -I ./deps
+ OBJECTS := src/text_encoding_detect.o src/Utils.o src/Converter.o src/main.o
+ DEPENDS := $(OBJECTS:.o=.d)