Fix Mac build.

source/3ds/cbmd.cpp

@@ -2,8 +2,8 @@
 
 #include "lz11.h"
 
+#include <stdlib.h>
 #include <string.h>
-#include <malloc.h>
 
 typedef struct {
     char magic[4] = {'C', 'B', 'M', 'D'};

source/3ds/util.cpp

@@ -33,6 +33,8 @@ u16 pack_color(u8 r, u8 g, u8 b, u8 a, PixelFormat format) {
         a >>= 4;
         return r << 12 | g << 8 | b << 4 | a;
     }
+
+	return 0;
 }
 
 u8* load_image(const char* image, u32 width, u32 height) {