std::size_t -> size_t

Removing std prefix from all size_t.

src/RageSurfaceUtils.cpp

@@ -859,7 +859,7 @@ RageSurface *RageSurfaceUtils::PalettizeToGrayscale( const RageSurface *src_surf
 	const unsigned int Amask = ((1u << AlphaBits) - 1u) << Ashift;	// alpha mask
 	const unsigned int Aloss = 8u-AlphaBits;
 
-	for( std::size_t index = 0; index < TotalColors; ++index )
+	for( size_t index = 0; index < TotalColors; ++index )
 	{
 		const unsigned int I = (index & Imask) >> Ishift;
 		const unsigned int A = (index & Amask) >> Ashift;