[x11drv] Fix X11DRV_set_wm_hints

[Maxime Bellengé]

Resent without MWM_FUNC_RESIZE as indicated by Dmitry Timoshkov

Short story:
- Fix unmovable windows if the window style is set to WS_POPUP |
WS_VISIBLE and WS_EX_APPWINDOW
- Fix metacity displaying decorations where it should not.

Long story:

I have two different applications where I can't move the window.
These applications completely skin each of their windows.
Their main window resources are defined like this :

IDD_TRANSPARENTDIALOG_DIALOG DIALOGEX 0, 0, 292, 184
STYLE WS_POPUP | WS_VISIBLE
EXSTYLE WS_EX_APPWINDOW
FONT 8, "MS Sans Serif"
BEGIN
    PUSHBUTTON      "&Close",IDC_CLOSE,249,6,33,12
END

To move a window they call PostMessage( WM_NCLBUTTONDOWN, HTCAPTION,
MAKELPARAM( point.x, point.y)); on a WM_LBUTTONDOWN message.

This patch adds MWM_FUNC_MOVE when WS_EX_APPWINDOW.
Now the windows are movable.

This patch adds another WM test. These windows must not have
decorations. Fluxbox does not display any however metacity displays
them. Actually, if a style like MWM_DECOR_MINIMIZE is set, metacity
displays the whole decorations whereas fluxbox doesn't. In Windows, if
you set WS_MINIMIZEBOX without WS_CAPTION, the caption is not displayed.
So I changed the code to only set MWM_DECOR_MINIMIZE,
MWM_DECOR_MAXIMIZE, MWM_DECOR_MENU if WM_CAPTION is set.

Changelog:
- Fix unmovable windows if the window style is set to WS_POPUP |
WS_VISIBLE and WS_EX_APPWINDOW (thanks to Mike Hearn)
- Fix metacity displaying decorations where it should not.
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