ecore_x: XKeycodeToKeysym

ecore_x: XKeycodeToKeysym

ecore_x is calling XKeycodeToKeysym from xlib, but this function has issues. It
has been deprecated 6 months ago in X.org and it is suggested to use
XkbKeycodeToKeysym instead: https://bugs.freedesktop.org/show_bug.cgi?id=25732

This commit makes a wrapper function that makes use of XkbKeycodeToKeysym when
possible or fallback to XKeycodeToKeysym otherwise.

git-svn-id: svn+ssh://svn.enlightenment.org/var/svn/e/trunk/ecore@71677 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33