drop forced fontconfig cache generation, should not be needed

Per discussion on #1169979, fontconfig upstream think they have
the bugs licked, so this shouldn't be needed any more. We need
to check the nightly lives after this and see if their caches
are now correct.

fedora-live-base.ks

@@ -313,12 +313,6 @@ rm -f /core*
 # convince readahead not to collect
 # FIXME: for systemd
 
-# forcibly regenerate fontconfig cache (so long as this live image has
-# fontconfig) - see #1169979
-if [ -x /usr/bin/fc-cache ] ; then
-   fc-cache -f
-fi
-
 echo 'File created by kickstart. See systemd-update-done.service(8).' \
     | tee /etc/.updated >/var/.updated