[X11drv] WS_CAPTION window style switch support

[Karsten Elfenbein]

* added support for setting WS_CAPTION window style

It allows EVE Online to change from the non WS_CAPTION login window to a
native X window with WS_CAPTION active.
The only problem is that the Device_Reset function in wined3d seems to
disable WS_CAPTION flag when RestoreWindow is calling SetWindowPos. This
is caused by "This->style" still having the window without WS_CAPTION
flag.
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