Use linear metrics with new FreeType light autohint.

Starting in FreeType 2.8 the light hinting setting only hints in the y
direction and can be used with linear metrics and subpixel positioning.

Change-Id: I6e478a904001216ade7f319fe98aa863ac6bd672
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/211105
Auto-Submit: Ben Wagner <bungeman@google.com>
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
1 file changed