[Fontconfig] performance optimizations

[Kyle Rose]

Keith Packard <keithp at keithp.com> writes:

> Now I'm confused -- I thought the time was consumed by wandering through 
> miles of bitmap fonts.  Eliminating essentially all of the bitmap fonts 
> seems like a good way to make that faster...

What about those of us who want to use bitmap fonts in applications
that insist on getting fonts from fontconfig? :)

Kyle