Add -L to LDFLAGS, not CFLAGS for macos builds

This fixes all the "argument unused during compliation" warnings

src/build/Common.gmake

@@ -389,7 +389,7 @@ ifeq ($(os),darwin)
  LDFLAGS += -mmacosx-version-min=$(MIN_MAC_OSX_VERSION)
  ifneq (,$(shell which brew))
   CFLAGS += -I$(shell brew --prefix)/include
-  CFLAGS += -L$(shell brew --prefix)/lib
+  LDFLAGS += -L$(shell brew --prefix)/lib
  endif
 endif
 ifeq ($(os),linux)    # Linux