Doc: Adding "qtdoc" to the depends qdocconf variable.

-needed to link to Qt 5.2 docs (as seen on the navigation bar)

Change-Id: Icc0bdb95231dbccd0393d4f401daafd8bcb30472
Reviewed-by: Martin Smith <martin.smith@digia.com>
Make QCoreApplicationPrivate::appName() thread-safe

Change-Id: Iea0d208e3e4721fff8a6667e0df1203a887c29d3
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>