Log Message:
security/clamav: update to 0.103.8

pkgsrc change: avoid use empty in options.mk.

Security release.

0.103.8 (2023-02-15)

* \ 
CVE-2023-20032<https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-20032>:
  Fixed a possible remote code execution vulnerability in the HFS+ file
  parser.  The issue affects versions 1.0.0 and earlier, 0.105.1 and
  earlier, and 0.103.7 and earlier.  Thank you to Simon Scannell for
  reporting this issue.

* \ 
CVE-2023-20052<https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-20052>:
  Fixed a possible remote information leak vulnerability in the DMG file
  parser.  The issue affects versions 1.0.0 and earlier, 0.105.1 and
  earlier, and 0.103.7 and earlier.  Thank you to Simon Scannell for
  reporting this issue.

* Update the vendored libmspack library to version 0.11alpha.

* GitHub pull request: https://github.com/Cisco-Talos/clamav/pull/830