Fix documentation generated against Qt5...
Fix documentation generated against Qt5
The image files that are not referenced in any qdoc file are not defined
as extraimages separately for both Qt4 and Qt5. There are still warnings
of deprecated markup commands when generating the documentation against
Qt5 but the documentation itself now looks good.
Task-number: QTRD-1908
Change-Id: I5bb1ac4ce1899bcde99c42180bd2f3e715b9151a
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@digia.com>