[nostalgia/core] Make sprite functions take core::Context argument

src/nostalgia/core/sdl/gfx.cpp

@@ -200,10 +200,10 @@ void setTile(Context *ctx, int layer, int column, int row, uint8_t tile) {
 	id->bgTileMaps[z][y][x] = tile;
 }
 
-void hideSprite(unsigned) {
+void hideSprite(Context*, unsigned) {
 }
 
-void setSprite(unsigned, unsigned, unsigned, unsigned, unsigned, unsigned, unsigned) {
+void setSprite(Context*, unsigned, unsigned, unsigned, unsigned, unsigned, unsigned, unsigned) {
 }
 
 }