Fix bindings of QMessageLogContext
Fix bindings of QMessageLogContext

Pass a reference instead of copying it since it has
a private copy constructor.

Task-number: PYSIDE-346
Change-Id: Id4f75a279d22d295b991fd7eb20225d73b146be7
Reviewed-by: Christian Tismer <3f32342346a37828fd9c8841ea4579d28b46cf08@stackless.com>

qtproject/pyside-pyside,qtproject/pyside-pyside,qtproject/pyside-pyside,qtproject/pyside-pyside,qtproject/pyside-pyside