Make PCRE's JIT work on Android devices

__clear_cache is missing from Android; use cacheflush instead.

Backport in Qt's own PCRE copy of the upstream fix:
http://vcs.pcre.org/viewvc?view=revision&revision=1340

Task-number: QTBUG-31754
Change-Id: I4996265f7b19343ba24983d4f8b2f75e2b578504
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Doc: added more details about contains(variablename,value)

Task-number: QTBUG-31428
Change-Id: Ie9b4a1f5392f24b5b0b2cb94115edd0814ba92d1
Reviewed-by: Martin Smith <martin.smith@digia.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
If a QWidget is ignored for auto-quit, ignore its corresponding QWindow.

Unit test by Friedemann Kleint <Friedemann.Kleint@digia.com>

Task-number: QTBUG-31569
Change-Id: I526d33d4f88a41f6ac349098476bc45af6c841b0
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
QNX: Add option to disable screen power save from an envvar

Qt itself has no API for disabling screen power save, although this
might make an interesting addition at some point.

Instead we make the QNX QPA plugin determine if power save should be
disabled from the QQNX_DISABLE_POWER_SAVE environment variable. This
would typically be set in the application's bar descriptor file.

Change-Id: Ie195ecd0496efd533ad9a32b65883283f471c534
Reviewed-by: Kevin Krammer <kevin.krammer@kdab.com>
Reviewed-by: Rafael Roquetto <rafael.roquetto@kdab.com>
QNX: Fix screen rotation

The behavior introduced by qtdeclarative's 475d1ed4f6a2 mandates that an
expose event follows a geometry change event. The fix for this uncovered a bug
on the raster backing store which caused the rotation to break on QtWidgets.
The problem was rooted on the assumption that the
QQnxRasterBackingStore::flush() method was only called after paints to the
backing store surface, which was discovered to be a false assumption. Flushing
the backing store can occur in other circunstances, which are out of scope on
the context of the QNX plugin.

Task-number: QTBUG-31329
Change-Id: Icfc3e85324f5a8745f6b5f189f27f8b763f770c7
Reviewed-by: Kevin Krammer <kevin.krammer@kdab.com>
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>