Windows x86 ARM capability

This seems to fix crash issues on 10.9.5 reported on Chrome, compare
crbug.com/549610

According to comments in issue #305 broken GDEF tables lead
to incorrect rendering of Latin characters. Blacklisting
this font.

Support Americanist Phonetic Notation

OpenType language system tag: `APPH`
https://www.microsoft.com/typography/otspec/languagetags.htm

IETF BCP47 variant tag: `fonnapa`
http://www.iana.org/assignments/language-subtag-registry/language-subtag-registry

[travis] Fix MacOS libtool issue

Reveals another MacOS build breakage in the Core Text shaper.

Using font from https://github.com/behdad/harfbuzz/issues/300

Fixes https://github.com/behdad/harfbuzz/issues/300

Limits number of alternatives per glyph per feature to 255, so be it.
That's better than possibly breaking shaping because of one bad feature
value.

This one:

  map->mask = (1 << (next_bit + bits_needed)) - (1 << next_bit);

before the fix, the shift was done as an int, causing overflow
if it ever got to 1 << 31.  Sprinkle 'u's around.

Fixes https://bugs.chromium.org/p/chromium/issues/detail?id=634805

Fixes https://github.com/behdad/harfbuzz/issues/300

Regression from: b424b6c3.

Fixes https://github.com/behdad/harfbuzz/issues/297

Fixes https://github.com/grigorig/ucdn/issues/12

This is based on bug reports that have been filed against Firefox since it
updated to a version of harfbuzz that uses zeroing by GDEF rather than by
Unicode. I'm sure there are a bunch more font versions that should also be
included; these are just the ones I have on hand and have confirmed as having
bad GDEF data.

Given how the list here is growing, I think we should reconsider the approach,
and perhaps revert to zeroing by Unicode instead.

Fixes https://github.com/behdad/harfbuzz/issues/264
Fixes https://github.com/behdad/harfbuzz/pull/266

Fixes https://github.com/behdad/harfbuzz/issues/236
Fixes https://bugs.chromium.org/p/chromium/issues/detail?id=627953

Fixes https://bugs.chromium.org/p/chromium/issues/detail?id=614647
If allocation fails, we might be leaving junk behind.  At least
clear it up.

Prior to this change the function `FT_Error FT_Done_Face(FT_Face *)` was
called through a pointer with the signature `void (void *)` resulting in
undefined behaviour.

[introspection] Fix hb_tag_from_string annotation

Fixes https://github.com/behdad/harfbuzz/pull/271

Discard reconfigured CTFont if URL changes