Remove QT_STATIC_CONST.

More information: https://qt.gitorious.org/qt/qtbase/commit/11c30f9705e796ebabcdd868bce3ad3664cc06eb
Merge pull request #1 from rdebroiz/Qt_static_const_macro

Remove QT_STATIC_CONST.
Merge master.
Merge branch 'master' into metatype