Revert "remove legacy SkPath enum guards"

This reverts commit 7fdceb9.

Reason for revert: need more fixes in flutter (getFillType)

Original change's description:
> remove legacy SkPath enum guards
> 
> Change-Id: I5874ac89b6dec5c050bc02df9df6849d2131df76
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/257690
> Reviewed-by: Mike Reed <reed@google.com>
> Commit-Queue: Mike Reed <reed@google.com>

TBR=reed@google.com

Change-Id: I7b65e51b53dc15739ddeb76d9b5fd18d956f4cfd
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/257879
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>

Author: reed-at-google

gn/flutter_defines.gni

@@ -13,6 +13,8 @@ flutter_defines = [
   "SK_DISABLE_AAA",
 
   # API staging
+  "SK_SUPPORT_LEGACY_PATH_DIRECTION_ENUM",
+  "SK_SUPPORT_LEGACY_PATH_FILLTYPE_ENUM",
 
   # Flutter doesn't deserialize anything.
   "SK_DISABLE_READBUFFER",