message: Don't clear CFLAGS
  Regression since
diff: @@ -59,7 +59,6 @@ CXXFLAGS := -O3 -DNDEBUG -fPIC
  CXXFLAGS += $(EXTRA_CXXFLAGS)
  CFLAGS := ${CXXFLAGS}
  CXXFLAGS += --std=c++11
  -CFLAGS :=
  LDOPTS := -L/usr/local/lib
  ARFLAGS := -r
  TARGET_TOOLCHAIN_PREFIX :=
  