Update the local FreeType version that is statically linked for
layout tests to 2.7.1 plus patches, the same version that we use
on Android.

The FreeType 2.7.x series enable interpreter version 40 of the TrueType
hinting interpreter, which performs subpixel hinting and results in a
rendering result more similar to newer Windows versions. It does not
produce strict, bilevel-style hinting results as before. This leads to
slightly wider advance widths in many cases for our layout test
baselines.

This allows us to enable the
fast/text/variable-fonts/variable-box-font.html
http/tests/webfont/variable-box-font-arraybuffer.html tests for
OpenType Font Variations, since this FreeType version has
sufficient support for it. It will also help us with testing
color emoji fonts, as well as allowing us to fuse the two
checkouts for freetype-android and freetype2 in the near future.

BUG=274030

Change-Id: I2524902d8f48c9b0fdf2c5d86943c6f9615cccc2
Reviewed-on: https://chromium-review.googlesource.com/444189


Commit-Queue: Dominik Röttsches <drott@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#453211}