[OGL] Textures now save to PNG not TGA

Source/Core/VideoCommon/Src/ImageWrite.h

@@ -7,7 +7,6 @@
 
 #include "Common.h"
 
-bool SaveTGA(const char* filename, int width, int height, void* pdata);
 bool SaveData(const char* filename, const char* pdata);
 bool TextureToPng(u8* data, int row_stride, const char* filename, int width, int height, bool saveAlpha = true);