libxfont: fixes + test block
libxfont: fixes + test block

Closes Linuxbrew/homebrew-xorg#274.

Signed-off-by: LinuxbrewTestBot <18b3417ba374eaf3ad4b67b014b8678aef44e242@linuxbrew.sh>

LinuxbrewTestBot/homebrew-xorg,Linuxbrew/homebrew-xorg,maxim-belkin/homebrew-xorg