MFH: r553863 r555201

Update xfce4-wm to 4.14.6

Import upstream patch to avoid crash due to unhandled XError in
XKillClient()

PR: 251136
Submitted by: rozhuk.im@gmail.com
Obtained from: https://gitlab.xfce.org/xfce/xfwm4/-/commit/e2fbfac304beace0297d071f7de0aceba4f0016a

Approved by: ports-secteam (riggs, fluffy)