BlackBerry: Adjust rotation according to initial orientation

cherry-picked from qtbase f0425e115e5fe5d29191f0752659a28e9a4b6757

Task-number: QTBUG-29201
Change-Id: Iec31057749d98d66d43f13635da20d097756c8ea
Reviewed-by: Thomas McGuire <thomas.mcguire@kdab.com>
QGtkStyle: remove an unnecessary sanity check for theme name

This makes QGtkStyle working again on Debian experimental
and Ubuntu 13.04, where getThemeName() returns empty value.

Backported from QtBase b72aa1cad30a44b1.

Change-Id: If4cc822970088a5fb31aa28d9951db1efc0bb4fd
Reviewed-by: J-P Nurmi <jpnurmi@digia.com>
Don't use UNAME_MACHINE on Linux

We don't need it. Let linux-g++ be the default on all Linux builds,
period.

Task-number: QTBUG-30590
Change-Id: I26c73bf4f054684763b64ef5651b3488363ea7a1
(cherry-picked from qtbase commit 2c5188f0777f4a0723b4cb9fd36354a357145519)
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>