Add a makefile INCLUDE_LIB_PNGH to allow not including png.h in burner.h

makefile

@@ -54,6 +54,9 @@ PERL = 1
 # Endianness
 LSB_FIRST = 1
 
+# Include png.h from burner.h
+INCLUDE_LIB_PNGH = 1
+
 
 #
 #	execute an appropriate system-specific makefile

makefile.mingw

@@ -282,6 +282,10 @@ ifdef LSB_FIRST
 	DEF	:= $(DEF) -DLSB_FIRST
 endif
 
+ifdef INCLUDE_LIB_PNGH
+	DEF	:= $(DEF) -DINCLUDE_LIB_PNGH
+endif
+
 ifdef BUILD_A68K
 	DEF	:= $(DEF) -DBUILD_A68K
 endif

makefile.vc

@@ -196,6 +196,10 @@ ifdef LSB_FIRST
 	DEF	:= $(DEF) /DLSB_FIRST
 endif
 
+ifdef INCLUDE_LIB_PNGH
+	DEF := $(DEF) /DINCLUDE_LIB_PNGH
+endif
+
 ifdef BUILD_A68K
 	DEF	:= $(DEF) /DBUILD_A68K
 endif

src/burner/burner.h

@@ -42,7 +42,9 @@ typedef struct tagIMAGE {
  #include "burner_xbox.h"
 #endif
 
-#include "png.h"
+#if defined (INCLUDE_LIB_PNGH)
+ #include "png.h"
+#endif
 
 // ---------------------------------------------------------------------------
 // OS independent functionality