[Fontconfig] mmap branch vs gnome-terminal

[Matthias Clasen]

Here is another problem I met after installing the mmap branch
fontconfig system-wide on my system. gnome-terminal doesn't
seem to find fonts anymore. I haven't yet tried to follow all the
fontconfig pattern manipulation done in vte, but it seems to
trigger an incompatibility. 

A similar problem seems to affect the previews in the font capplet,
which also seem to pick up a very small font size. 

The rest of the desktop seems to work fine.

Matthias