[QNX] Fix crash when creating eglSurface

Change-Id: I9cf9d56003a5f237dcf00b621fddf74e8d0ca190
Reviewed-by: Rafael Roquetto <rafael.roquetto@kdab.com>
[QNX} Remove adjustBufferSize from the egl window

setGeometry will adjust the buffer for an egl window when a egl surface is created.
Adjusting the buffer somewhere else can be potentially harmful. Another reason is that
every egl window has a buffer on its own (unlike raster windows) so we do not have to
check if we have to create a buffer after reparanting.

Change-Id: I01406867a0dab598dac7d86e1f1e28ca9736a299
Reviewed-by: Rafael Roquetto <rafael.roquetto@kdab.com>
[QNX] Handle the case when an egl surface can not be created

If an egl surface can not be created (e.g. when out of memory) the
application should not crash. In this case we will not be able to make
the egl surface current and have to return false in the makeCurrent call
in QQnxGlContext.

Change-Id: If9b5a82a0f64dc0a42bee687d351bea43fb05d51
Reviewed-by: Rafael Roquetto <rafael.roquetto@kdab.com>