skslc now uses a more recent version of Flex

Bug: 6447
Change-Id: Ie1cb674752442a8992dd247abb2bcace8497c1f4
Reviewed-on: https://skia-review.googlesource.com/11014
Reviewed-by: Ben Wagner <benjaminwagner@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
4 files changed