Font cache is not build by default, which makes related lines in
default configure file wrong, which in turn causes xfs to error out
on startup with default file. Tweak generation of said file in a way
that would make proper configuration depending on existance of font
caching code, so that this patch can be sent upstream. [2]
Inspired by: Jose M Rodriguez (josemi at freebsd.jazztel.es) [1]
Bits and pieces for [1] stolen from:
src/etc/rc.d/xfs, apache2 and squid ports
Noticed by: Gary Dunn (knowtree at aloha.com) [2]
6e74169b0c