fontconfig: bump to version 2.11.1

Fixes misinstallation of xfont_font-bh-ttf-1.0.3/42-luxi-mono.conf to
'target@baseconfigdir@/conf.avail/42-luxi-mono.conf'
instead of proper place in the target directory (because of buggy
fontconfig.pc file).

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>