Standalone xvfb-run script and man page, suitable for use as source
for a distro package of xvfb-run.

For years, Debian has packaged xvfb-run in their xvfb .deb, but the
"source" for it was their .diff for xorg-server. All I did here is
download their source package, xorg-server_21.1.14.orig.tar.gz, apply
their xorg-server_21.1.14-2.diff.gz, copy the xvfb-run and xvfb-run
files from debian/local, and tar them up.

The xvfb-run script hasn't changed since 2018, and its man page hasn't
changed since 2020.

I didn't include a license or copyright file in the tarball, because
I have no idea what the license is for the xvfb-run script. It's not
actually part of the xorg-server source from upstream (from X.org I
mean), and the Debian packaging only includes the X.org license, which
lists lots of contributors, but not the authors of xvfb-run. Debian
doesn't include a specific license for xvfb-run, and there's no
license or copyright info in the comments in the script or its man
page. I tried to contact the Debian maintainers for the xvfb package,
but got no response. I can't just write a license, since it's not my
code. If the lack of a license bothers you, don't use this.
