Revert to SDL_UpdateTexture; it is faster (#500)

https://forums.libsdl.org/viewtopic.php?t=9728

src/cdogs/blit.c

@@ -403,32 +403,7 @@ void BlitClearBuf(GraphicsDevice *g)
 }
 void BlitUpdateFromBuf(GraphicsDevice *g, SDL_Texture *t)
 {
-	int textureAccess;
-	if (SDL_QueryTexture(t, NULL, &textureAccess, NULL, NULL) != 0)
-	{
-		LOG(LM_GFX, LL_ERROR, "Failed to query texture: %s", SDL_GetError());
-		return;
-	}
-	if (textureAccess == SDL_TEXTUREACCESS_STATIC)
-	{
-		SDL_UpdateTexture(
-			t, NULL, g->buf, g->cachedConfig.Res.x * sizeof(Uint32));
-	}
-	else
-	{
-		CASSERT(
-			textureAccess == SDL_TEXTUREACCESS_STREAMING,
-			"invalid texture access");
-		void *pixels;
-		int pitch;
-		if (SDL_LockTexture(t, NULL, &pixels, &pitch) != 0)
-		{
-			LOG(LM_GFX, LL_ERROR, "Failed to lock texture: %s", SDL_GetError());
-			return;
-		}
-		memcpy(pixels, g->buf, GraphicsGetMemSize(&g->cachedConfig));
-		SDL_UnlockTexture(t);
-	}
+	SDL_UpdateTexture(t, NULL, g->buf, g->cachedConfig.Res.x * sizeof(Uint32));
 }
 
 static void RenderTexture(SDL_Renderer *r, SDL_Texture *t);