Doc: Fixed qdocconf merge issue

-qtdoc-project.qdocconf was removed in d4359e but git
 brought it back during a merge.
-Added 'qmake' in the depends because the merge didn't merge
 the change to the new file.

Change-Id: Iddcce47186c09d1799ed236878b72455ac62c3fe
Reviewed-by: Martin Smith <martin.smith@digia.com>