Previously was failing to match fonts that didn't support CHARSET_ANSI.

There still remains a problem with the Uniscribe backend, in that if a
font with the same family name is installed, and is newer, the native
one is preferred over the font we provide.  Fixing it requires rewriting
the name table with a unique family name...

Introduced in 99c26957.
Broken mark-mark and mark-ligature stuff.

Oops.  hb_tag_t and OPENTYPE_TAG have different endianness.  Perhaps
something to add API for in hb-uniscribe.h

Matches OT backend now.

Detected by clang and lots of cmdline options.

As reported by bashi.  Not tested.

New try.

Apparently the configure test is not enough...

Oops!

We're free!  Lazy or immediate...