Roll FreeType from a29e020059ca to 12ef831fc314 (3 revisions)

https://chromium.googlesource.com/chromium/src/third_party/freetype2.git/+log/a29e020059ca..12ef831fc314

2021-09-25 apodtele@gmail.com [builds/unix] Do not use autoconf SIZEOF.
2021-09-25 apodtele@gmail.com Propagate sign when reading OFF3.
2021-09-25 apodtele@gmail.com [bdf] Simplify comment collection or lack thereof.

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/freetype-chromium
Please CC drott@google.com,thestig@google.com,bungeman@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Chromium: https://bugs.chromium.org/p/chromium/issues/entry

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

Cq-Include-Trybots: luci.chromium.try:linux_chromium_msan_rel_ng;luci.chromium.try:linux-blink-rel;luci.chromium.try:mac10.12-blink-rel;luci.chromium.try:win10.20h2-blink-rel;luci.chromium.try:win7-blink-rel
Tbr: drott@google.com,thestig@google.com,bungeman@google.com
Change-Id: I113f2039767e060a8961b2174fb533a2220e7c1c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3183837
Bot-Commit: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: Ben Wagner <bungeman@chromium.org>
Reviewed-by: Ben Wagner <bungeman@chromium.org>
Cr-Commit-Position: refs/heads/main@{#925327}