Summary: Fix broken internal links on export

Test case.

(setq org-link-search-must-match-exact-headline t)

# file temp.org

* Heading 1
  Some content.

* Heading 2
  There is a link to [[Heading 1]] here.

Export this to html and note that [[Heading 1]] is wrongly
translated. Apply the patch. See that the internal link is correctly
exported.

 <p>
-There is a link to <a href="#Heading==1">Heading 1</a> here.
+There is a link to <a href="#sec-1">Heading 1</a> here.
 </p></div>
 </div>

Note: 
Is 'dedicated the right value to return?


Jambunathan K.