remove --undefok

I think we originally added this for the bots, back in the good old days
when the bot scripts weren't versioned with Skia.  No bots use this now.

Change-Id: Icdee95d27fb928d0215601e082d056e611eb6202
Reviewed-on: https://skia-review.googlesource.com/c/181980
Reviewed-by: Ben Wagner <benjaminwagner@google.com>
Commit-Queue: Ben Wagner <benjaminwagner@google.com>
3 files changed