Update FreeType to e432ebf2 (2.7.1 + patches)

A major new feature since 2.7 is Opentype 1.8 (variable font) and
1.8.1 (CFF2 - variable font) support.

BUG: 34742506
Test: build freetype and install on a device.
Change-Id: I480fbd09bfa0ad25fe38a22ee0f584059587dc72
281 files changed