[Qt] Define MODULE_VERSION
https://bugs.webkit.org/show_bug.cgi?id=112808

Reviewed by Allan Sandfeld Jensen.

Upstream http://codereview.qt-project.org/49052
Use 5.2.0 as this is the next release that will be branched from trunk.

* .qmake.conf:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@146363 268f45cc-cd09-0410-ab3c-d52691b4dbfc