[Xmonad] darcs patch: Add LANGUAGE pragmas

Shachaf Ben-Kiki * Add LANGUAGE pragmas It seems that GHC 6.6 just enables -fglasgow-exts when it sees any LANGUAGE pragma, so not all of them were added; this patch adds the rest of them, which is necessary for xmonad to compile in GHC >=6.7. Attached are patches both for the core and for XMonadContrib. Shachaf