Avoid recreating the underlying context in QGLContext wrappers

QGLContexts created from a QOpenGLContext get their valid flag reset,
resulting in creating a totally new underlying context. This is wrong
and becomes visible when sharing is expected between contexts (since the
QGLContext's underlying QOpenGLContext will not have sharing).

Task-number: QTBUG-37893
Change-Id: I8cb37c11dfb400a77e510bf4c8219bedc742309e
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>
Fixes related to evdev in the configure script

This adds evdev to the help, configure status output and will include
it in the qconfig.h.

Change-Id: Ibc07516ab07e7c53ec89b167d604f5cefa2d92b7
Reviewed-by: Fabian Bumberger <fbumberger@rim.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
BlackBerry,QNX: Switch to QMAKE_PLATFORM from CONFIG

This is the right configuration of the platform within the mkspecs.
It enables the usage of additional features like the automatic
detection of platform specific prf files.

Change-Id: I2f19265d283e47c62455128f217bc44ba88cdc98
Reviewed-by: Sergio Ahumada <sahumada@blackberry.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Fix cross platform detection of evdev on win32

Evdev is not known to the windows configure and therefore some code
is currently broken which depends on QT_NO_EVDEV. This patch
introduces evdev to the configure app on windows and disables
evdev support for cross compilation if not available.

Change-Id: I6acb5b593668c85a19ef8658a8d4c36ec3d2a686
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Update bundled libxkbcommon version to 0.4.1

This is the latest version, released on Mar 27 2014. It includes:

https://bugs.freedesktop.org/show_bug.cgi?id=75798
https://bugs.freedesktop.org/show_bug.cgi?id=75892

Required for fixing input when running Qt application on Mac OS X
with XQuartz and for fixing QTBUG-36281.

Change-Id: Idc4d3c99a4008a10b91ab51c8910b36909974703
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Fix regression in key handling.

libxkbcommon 0.4.1 added two new functions, xkb_state_key_get_utf{8,32}(). They
combine the operations of xkb_state_key_get_syms() and xkb_keysym_to_utf{8,32}().

The xkb_state_key_get_utf{8,32}() functions now apply Control transformation: when
the Control modifier is active, the string is converted to an appropriate control
character. This matches the behavior of libX11's XLookupString(3), and is required by
the XKB specification:

http://www.x.org/releases/current/doc/kbproto/xkbproto.html#Interpreting_the_Control_Modifier

Task-number: QTBUG-36281
Change-Id: Ib45f45d801291c171640600384107a35d7d56b9b
Reviewed-by: Ran Benita <ran234@gmail.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>