haskell-mode-find-def failing; additional quote characters needed; fix included

[genovese]

With recent versions of GHC, the :info name command returns a module name in quotes that are unicode characters (in particular x2018 ‘ and x2019 ’). The matching in haskell-mode-find-def only has the ASCII `' quotes.

In line 443 in the current HEAD

    (string-match "`\\(.+?\\):\\(.+?\\)'$" defined)

could be changed to

    (string-match "[`‘]\\(.+?\\):\\(.+?\\)['’]$" defined)

and in line 448 in the current HEAD

    (string-match "`\\(.+?\\)'$" defined))

could be changed to

    (string-match "[`‘]\\(.+?\\)['’]$" defined)

When making these changes only, haskell-mode-find-def now works, whereas before it returned nil.