[PATCH] user32: Allow WM_CAPTURECHANGE indicating SetCapture() parameter.

[Christopher Thielen]

Fixes https://bugs.winehq.org/show_bug.cgi?id=13683

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.

Re-submitting as attachment as mail client previously malformed patch 
with line wrapping.

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