Fix CoreText font scaling again

This partially reverts 25ad29b488d3e2ae10e4fee25602409fa39207f1
which itself was a revert.  Apparently we want the change in
CoreText, but not on Win32...

See mailing list discussion.
don't break words between a letter adjacent to a number

Newer Unicode specs (6.2 for instance)
say that one should not break between letter or numbers
that are adjacent. This also makes us to match word selection
with many text capable apps.
Merge branch 'master' of git://git.gnome.org/pango
Merge branch 'master' of https://github.com/johne53/MB3Pango