[PATCH] user32: Allow WM_CAPTURECHANGED indicating SetCapture() parameter

[Christopher Thielen]

A window may be notified with WM_CAPTURECHANGED about itself
gaining mouse capture if it calls SetCapture() twice.

Tested on Windows XP and Fedora Workstation 22.

Revised to simplify based on wine-devel feedback.
Revised to address any side-effects of new WM_CAPTURECHANGED
messages.

Signed-off-by: Christopher Thielen <cthielen at gmail.com>
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