Rename png.h to makepng.h, to avoid conflicts with libpng's png.h.

Makefile

@@ -45,7 +45,7 @@ rgbfix_obj = \
 rgbgfx_obj = \
 	src/gfx/gb.o \
 	src/gfx/main.o \
-	src/gfx/png.o \
+	src/gfx/makepng.o \
 	src/extern/err.o
 
 all: rgbasm rgblink rgbfix rgbgfx

include/gfx/main.h

@@ -69,7 +69,7 @@ struct Tilemap {
 
 int depth, colors;
 
-#include "gfx/png.h"
+#include "gfx/makepng.h"
 #include "gfx/gb.h"
 
 #endif