Update Makefile

src/Makefile

@@ -270,7 +270,7 @@ endif
 #  -D_DEFAULT_SOURCE        use with -std=c99 on Linux and PLATFORM_WEB, required for timespec
 #  -Werror=pointer-arith    catch unportable code that does direct arithmetic on void pointers
 #  -fno-strict-aliasing     jar_xm.h does shady stuff (breaks strict aliasing)
-CFLAGS += -Wall -D_DEFAULT_SOURCE -Wno-missing-braces -Werror=pointer-arith -fno-strict-aliasing
+override CFLAGS += -Wall -D_DEFAULT_SOURCE -Wno-missing-braces -Werror=pointer-arith -fno-strict-aliasing
 
 ifeq ($(PLATFORM), PLATFORM_WEB)
     CFLAGS += -std=gnu99