Fix MessageBox that doesn't contains Cancel button

[Cyril Margorin]

Hello,

The MessageBox without Cancel button shouldn't have the WS_SYSMENU
style (escaping from dialog should be disabled). The only exception is
Ok-only message box.

Patch attached.

ChangeLog:
Cyril Margorin <comargo at gmail.com>
    Suppress WS_SYSMENU style for message box with out Cancel button.

--
Cyril Margorin
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