Decouple <cstdint>

src/RageSurface_Load_PNG.cpp

@@ -1,13 +1,15 @@
 #include "global.h"
 
-#include <png.h>
-
 #include "RageSurface_Load_PNG.h"
 #include "RageUtil.h"
 #include "RageLog.h"
 #include "RageFile.h"
 #include "RageSurface.h"
 
+#include <cstdint>
+
+#include <png.h>
+
 #if defined(_MSC_VER)
 #if defined(_BINARY_PNG)
 #pragma comment(lib, "libpng.lib")
@@ -142,7 +144,7 @@ static RageSurface *RageSurface_Load_PNG( RageFile *f, const char *fn, char erro
 		/* Fake PNG_COLOR_TYPE_GRAY. */
 		for( int i = 0; i < 256; ++i )
 		{
-			colors[i].r = colors[i].g = colors[i].b = (int8_t) i;
+			colors[i].r = colors[i].g = colors[i].b = (std::int8_t) i;
 			colors[i].a = 0xFF;
 		}