winex11.drv: Support _KDE_NET_WM_STATE_SKIP_SWITCHER.
KWin has a switcher that triggered by Alt+Tab that basically acts like a pager. And hiding items in the switcher is controlled by _KDE_NET_WM_STATE_SKIP_SWITCHER.
KWin has a switcher that triggered by Alt+Tab that basically acts like a pager. And hiding items in the switcher is controlled by _KDE_NET_WM_STATE_SKIP_SWITCHER.