search for 'main' explicitly

Change-Id: Ie88b935a75d8b9c253b29bf0aa4ef39649327bfa
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/228119
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Reed <reed@google.com>
2 files changed