Add patch to libxfce4menu reverting part of upstream commit 85d8d390,
adding back code to ungrab all keys before grabbing them again.

The call has been removed upstream due to causing problems with tty
switching on linux, but testing in FreeBSD show no such problems
when switching to and from vty, and fix issues with keys not working
properly in FreeBSD.

PR: 244290
Submitted by: aryeh.friedman@gmail.com,

		Jethro Nederhof <jethro@jethron.id.au> (suggested patch)

Reported by: many
MFH: 2021Q1