[xmonad] Issue 240 in xmonad: recompilation fails silently

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Updates:
	Status: Fixed

Comment #5 on issue 240 by vogt.a... at gmail.com: recompilation fails silently
http://code.google.com/p/xmonad/issues/detail?id=240

On further consideration I think the patch in #4 isn't worth the  
complexity. A compromise is to call ghc with flags:

  -main-is main

which makes it print (to stderr) a warning that the user might be able to  
find and interpret without too much trouble:

Warning: output was redirected with -o, but no output will be generated
because there is no Main module.