libxdamage: fix dependencies
libxdamage: fix dependencies

- Remove explicit dependency on 'xextproto' (brought in by 'fixesproto')
- Make 'damageproto' a normal dependency (based on .pc file)

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

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