skins2(Linux): check if _NET_WM_PID is supported
This kills X11 warnings for Ubuntu/Gnome. (cherry picked from commit 2eb55c6d8e2c2932a9703070fddabca6a18633e0)
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This kills X11 warnings for Ubuntu/Gnome. (cherry picked from commit 2eb55c6d8e2c2932a9703070fddabca6a18633e0)