Ignore Clang's -Wdeprecated-register for flex-generated code

This change fixes the Fuchsia build.

Change-Id: I9342e5aacf75067f01aff883ccf100d11b8f4462
Reviewed-on: https://skia-review.googlesource.com/9849
Reviewed-by: Michael Jurka <mikejurka@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
1 file changed