Remove SK_SUPPORT_LEGACY_BILERP2 dead code

Flag no longer defined.

Change-Id: I4b4aa33ecd23b485cf80d79882f52da96c82a567
Reviewed-on: https://skia-review.googlesource.com/36822
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
1 file changed