Clean Xkb masks in X.A.Submap
Clean Xkb masks in X.A.Submap

Ignore-this: 930e2bca230d5f403bf9c06650afc57b

Xkb adds its own mask and prevent Submap keybindings from normal
functioning when alternate layout is used. This patch cleans
these masks.

darcs-hash:20090623164653-7ba7e-d80f4f1ac09f4985e8d3ed9d2885a2c80058cb83

yzhou61/xmonad-contrib,yzhou61/xmonad-contrib,yzhou61/xmonad-contrib