Qnx: Fix UI warnings

Change-Id: Ia48031a3347e6267d9f84b5850860903d40bc801
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>
Autotests: Fix qbs build.

We accidentally added QT_NO_CAST_FROM_ASCII to the compiler command line
in the last patch.

Change-Id: I503d5b328d2ffb9812cd8cf79b5d52c8a76f07df
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>