Remove legacy renderer from source, build files and CI (#3384)

test/map/map.test.cpp

@@ -1634,12 +1634,8 @@ TEST(Map, StencilOverflow) {
     test.map.jumpTo(CameraOptions().withZoom(5));
     auto result = test.frontend.render(test.map);
 
-    // In drawable builds, no drawables are built because no bucket/tiledata is available.
-#if MLN_DRAWABLE_RENDERER
+    // No drawables are built because no bucket/tiledata is available.
     ASSERT_LE(0, result.stats.stencilUpdates);
-#else
-    ASSERT_LT(0, result.stats.stencilClears);
-#endif // MLN_DRAWABLE_RENDERER
 
 #if !defined(NDEBUG)
     Log::Info(Event::General, result.stats.toString("\n"));