Makes for cleaner code.

Part of https://github.com/harfbuzz/harfbuzz/issues/1017

For consistency.

Splitted from #950 and #986 IIRC Chromium had a policy about this encouraging it,
not sure about automated way to detect and add them but for now lets have the needed
ones of them.

Such a headache that Windows defines UINT8, ...; Just prefix it.

Untested, but compiles.

This concludes https://github.com/behdad/harfbuzz/pull/568

get_glyph_from_name() coming soon.

https://ci.appveyor.com/project/behdad/harfbuzz/build/1.0.668/job/ikfj8peowgrp059t

The get_glyph_from_name() is incorrect; needs fixing.

Turns out we already have support for “post” table, it just needed to be
activated and put in use.