Do not compile CG on Google3 Linux/Android

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1783553003

Review URL: https://codereview.chromium.org/1783553003
diff --git a/public.bzl b/public.bzl
index 986bfd9..b06c1dd 100644
--- a/public.bzl
+++ b/public.bzl
@@ -150,6 +150,7 @@
         "src/opts/SkBlitMask_opts_none.cpp",
         "src/opts/SkBlitRow_opts_none.cpp",
         "src/ports/*android*",
+        "src/ports/*CG*",
         "src/ports/*chromium*",
         "src/ports/*mac*",
         "src/ports/*mozalloc*",
@@ -194,6 +195,7 @@
         "src/opts/SkBitmapProcState_opts_none.cpp",
         "src/opts/SkBlitMask_opts_none.cpp",
         "src/opts/SkBlitRow_opts_none.cpp",
+        "src/ports/*CG*",
         "src/ports/*chromium*",
         "src/ports/*fontconfig*",
         "src/ports/*FontConfig*",