make a varnish ebuild

[prototype99]

include a patch to fix
systemctl status varnishd.service
Warning: The unit file, source configuration file or drop-ins of varnishd.service changed on disk. Run 'systemctl daemon-reload' to reload units.
● varnishd.service - Varnish is a high-performance HTTP accelerator
Loaded: loaded (/lib/systemd/system/varnishd.service; enabled; vendor preset: disabled)
Active: failed (Result: exit-code) since Tue 2018-10-02 21:59:06 BST; 34s ago
Process: 9260 ExecStart=/usr/sbin/varnishd -a 0.0.0.0:80 -P /var/run/varnishd.pid (code=exited, status=2)

Oct 02 21:59:06 gay.memes systemd[1]: Starting Varnish is a high-performance HTTP accelerator...
Oct 02 21:59:06 gay.memes varnishd[9260]: Error: Neither -b nor -f given. (use -f '' to override)
Oct 02 21:59:06 gay.memes varnishd[9260]: (-? gives usage)
Oct 02 21:59:06 gay.memes systemd[1]: varnishd.service: Control process exited, code=exited status=2
Oct 02 21:59:06 gay.memes systemd[1]: varnishd.service: Failed with result 'exit-code'.
Oct 02 21:59:06 gay.memes systemd[1]: Failed to start Varnish is a high-performance HTTP accelerator.