Add more flags to be passed to makefile fragment

makefile

 
 build/Makefile: CMakeLists.txt
 	mkdir -p build
-	cd build && cmake .. -DCMAKE_BUILD_TYPE=Release $(addprefix -DINIT_FLAVOR=,$(INIT_FLAVOR))
+	cd build && cmake .. -DCMAKE_BUILD_TYPE=Release $(addprefix -DINIT_FLAVOR=,$(INIT_FLAVOR)) -DCMAKE_C_FLAGS="$(CFLAGS)" $(addprefix -DCMAKE_C_COMPILER=,$(CC))