patch to recognize file variables in the case of haskell pragmas, etc.

[Ransom Williams]

tali713 in the #emacs channel on irc.freenode suggested i submit this
as a patch:

The regexps to pass over when looking for -*-file:variables-*-, namely
"^#!" and "^'\\\\\"", were previously hardcoded in the set-auto-mode-1
function.  They are now in the file-auto-mode-ignore list along with a
regular expression for haskell pragmas.

i am not on the list, but feel free to copy me on any comments that
need addressing.

PATCH.txt
Description: Text document