libx11 1.6.7
libx11 1.6.7

Closes #467.

Signed-off-by: Maxim Belkin <032baa6ccf1d4eaa4536fc4f9b83b9a1f593449a@gmail.com>

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