Accepting request 871162 from home:adkorte

- Don't daemonize freshclam, but use a systemd timer instead to
  trigger updates
  + timer.freshclam
  % service.freshclam
  % clamav-conf.patch
- Remove obsolete patch (replaced by SOURCE_DATE_EPOCH)
  - clamav-disable-timestamps.patch
- Cleanup spec
  * use pkgconfig() to resolve BuildRequires where upstream uses it
  * rework creating vscan user (new system-user in Tumbleweed)
  * remove obsolete configure option --disable-zlib-vcheck

OBS-URL: https://build.opensuse.org/request/show/871162
OBS-URL: https://build.opensuse.org/package/show/security/clamav?expand=0&rev=218

timer.freshclam

@@ -0,0 +1,9 @@
+[Unit]
+Description=Timer for freshclam virus definitions downloader
+
+[Timer]
+OnUnitActiveSec=2h
+Persistent=true
+
+[Install]
+WantedBy=timers.target