[xmonad] [patch] xmonad-contrib: fix 7.10.2 build

[Tuncer Ayaz]

GHC change #10194 exposed a missing extension or otherwise made the
xmonad-compile not build with 7.10.2.

Attached you can find a patch to enable ImpredicativeTypes in one
module, in order to fix the build.

Tested with 7.10.2-rc2.
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