disable GPU support (Ganesh/OpenGL) for PathOps

Add skia_enable_ganesh=false and skia_use_gl=false to disable GPU
rendering support. PathOps only needs CPU-based path operations.

This reduces:
- Library size from 9.3M to 6.6M (~29% smaller)
- Compilation from 759 to 540 files (219 fewer files)
- Build time and CI resources

Author: anthrotype

build_skia.py

@@ -21,13 +21,15 @@
     "is_debug=false",
     "skia_enable_pdf=false",
     "skia_enable_discrete_gpu=false",
+    "skia_enable_ganesh=false",
     "skia_enable_skottie=false",
     "skia_enable_skshaper=false",
     "skia_use_dng_sdk=false",
     "skia_use_expat=false",
     "skia_use_freetype=false",
     "skia_use_fontconfig=false",
     "skia_use_fonthost_mac=false",
+    "skia_use_gl=false",
     "skia_use_harfbuzz=false",
     "skia_use_icu=false",
     "skia_use_libjpeg_turbo_encode=false",