security/clamav: Update to 0.104.0

• Upstream changed build tool from GNU Autotools to CMake
• Set TEST_TARGET
• Add pre-test-TESTS-off target to display message that TESTS option needs to be enabled to execute make test
• Switch to use pkg-messge instead of pkg-deinstall to display message for those who removes ClamAV permanently from you system
• Stop checking in rc scripts if /var/run/clamav exists
• Pet portclippy
• Reformat Makefile with portfmt

Release Notes: https://blog.clamav.net/2021/09/clamav-01040-released.html
PR: 258565
Differential Revision: https://reviews.freebsd.org/D32354