[freetype] Enable building freetype2 for Rust host targets

Add a new target that disables FT_CONFIG_OPTION_USE_PNG and uses `-fPIC`.

freetype2 and libpng fail to link when building for host, apparently due to
freetype2's use of private libpng symbols.

Bug: 8892
Bug: 36015
Bug: 36315

Depends-On: I0386586e7d69f0994a28438d5a0f652c983ab648
Change-Id: Id0e75da5176dcabc46a346ebcf81f16269f8df9a
2 files changed