Fix compilation of QWinInputContext with Q_IME_DEBUG defined.

Change-Id: I4f96b8ff57957e3cc370e5b1f37a036a619ce3f9
Task-number: QTBUG-40402
Reviewed-by: Liang Qi <liang.qi@digia.com>
qwidget_win.cpp: Initialize WINDOWPLACEMENT correctly.

Task-number: QTBUG-40466
Change-Id: I93ff7977d68d36bc89f98d6a43c103a2a8d730f7
Reviewed-by: Oliver Wolff <oliver.wolff@digia.com>