move largest apis into private

Related to https://skia-review.googlesource.com/c/skia/+/91860

Bug: skia:
Change-Id: Ia8fd981b422bbab75541b078277d2e09e1fc9d41
Reviewed-on: https://skia-review.googlesource.com/91940
Reviewed-by: Brian Salomon <bsalomon@google.com>
diff --git a/public.bzl b/public.bzl
index 1e28940..4b740bf 100644
--- a/public.bzl
+++ b/public.bzl
@@ -586,6 +586,7 @@
       "SK_JUMPER_DISABLE_8BIT",
       # JPEG is in codec_limited
       "SK_HAS_JPEG_LIBRARY",
+      "SK_SUPPORT_LEGACY_RECTMAKELARGEST",
   ] + skia_select(
       os_conditions,
       [