Fix corruption in some screen sizes

Looks like HWSURFACE doesn't work very well on SDL1.2 on the Pi, reverted to using SWSURFACE instead

src/osdep/rasp_gfx.cpp

@@ -186,7 +186,7 @@ static void open_screen(struct uae_prefs *p)
 	if (Dummy_prSDLScreen == NULL)
 	{
 //		Dummy_prSDLScreen = SDL_SetVideoMode(videoInfo->current_w, videoInfo->current_h, videoInfo->vfmt->BitsPerPixel, SDL_SWSURFACE | SDL_FULLSCREEN);
-		Dummy_prSDLScreen = SDL_SetVideoMode(width, height, 16, SDL_HWSURFACE | SDL_FULLSCREEN);
+		Dummy_prSDLScreen = SDL_SetVideoMode(width, height, 16, SDL_SWSURFACE | SDL_FULLSCREEN);
 	}
 
 	  // check if resolution hasn't changed in menu. Otherwise free the resources so that they will be re-generated with new resolution.
@@ -752,8 +752,8 @@ void picasso_InitResolutions(void)
 			int pixelFormat = 1 << rgbFormat;
 			pixelFormat |= RGBFF_CHUNKY;
       
-			//if (SDL_VideoModeOK (x_size_table[i], y_size_table[i], 16, SDL_HWSURFACE))
-			//{
+			if (SDL_VideoModeOK (x_size_table[i], y_size_table[i], 16, SDL_HWSURFACE))
+			{
 				DisplayModes[count].res.width = x_size_table[i];
 				DisplayModes[count].res.height = y_size_table[i];
 				DisplayModes[count].depth = bit_unit >> 3;
@@ -768,7 +768,7 @@ void picasso_InitResolutions(void)
 					DisplayModes[count].depth * 8);
   
 				count++;
-			//}
+			}
 		}
 	}
 	DisplayModes[count].depth = -1;