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/compilers/mrustc/patches/0002-dont-build-llvm.patch

@@ -0,0 +1,14 @@
+--- a/minicargo.mk
++++ b/minicargo.mk
+@@ -116,11 +116,6 @@
+ LLVM_CMAKE_OPTS += CMAKE_BUILD_TYPE=RelWithDebInfo
+ 
+ 
+-$(LLVM_CONFIG): $(RUSTCSRC)build/Makefile
+-	$Vcd $(RUSTCSRC)build && $(MAKE)
+-$(RUSTCSRC)build/Makefile: $(RUSTCSRC)src/llvm/CMakeLists.txt
+-	@mkdir -p $(RUSTCSRC)build
+-	$Vcd $(RUSTCSRC)build && cmake $(addprefix -D , $(LLVM_CMAKE_OPTS)) ../src/llvm
+ 
+ 
+ #