pango: Depends on x11 for Linuxbrew
pango: Depends on x11 for Linuxbrew

Fix the error: Package 'xcb-shm', required by 'cairo', not found

Closes Linuxbrew/homebrew-core#665.

Signed-off-by: Shaun Jackman <b580dab3251a9622aba3803114310c23fdb42900@gmail.com>

LinuxbrewTestBot/homebrew-core,maxim-belkin/homebrew-core,rwhogg/homebrew-core,LinuxbrewTestBot/homebrew-core,rwhogg/homebrew-core,Linuxbrew/homebrew-core,maxim-belkin/homebrew-core,Linuxbrew/homebrew-core