use private linkage where possible

Change-Id: I14e289bd44ab31fff081d5d63974e524232313a8
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
Build Bluetooth and NFC only for Blackberry

Plain QNX does not need to have Bluetooth and/or
NFC.

Change-Id: I6323d03292a2b72d21f8d947bb58205648cb0061
Reviewed-by: Tobias Koenig <tobias.koenig.qnx@kdab.com>
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>
Doc: Updated url variable in qdocconf files.

In 5.2, the HTML output is in a flatter structure and when they are
hosted in qt-project.org/doc, the documentation will be found at
http://qt-project.org/doc/qt-$QT_VER

The url variable is used by projects outside of Qt 5 which need
to link to Qt 5 documentation, such as Qt Creator.

Task-number: QTBUG-34584
Change-Id: I8ee21679bc4990bb8c81d8e4a7233d7ec2824ba7
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>
Merge remote-tracking branch 'origin/stable' into dev

Change-Id: I21c1c1bc2cffde68bb13f56f08e10564464585c1