Added libwacom and xf86-input-wacom for build time

Should resolves the issues that people have been having with the building of this package. Later, we should look and see if there is a way to disable wacom support -- perhaps a -wacom USE flag?
Update gnome-settings-daemon-3.11.90.ebuild
Update gnome-settings-daemon-3.11.90.ebuild
Merge pull request #123 from treeman1111/patch-1

Added libwacom and xf86-input-wacom for build time