Remove the picobsd (virtual) category from bsd.port.mk. I cannot find any port that uses it, so let's just get rid of it. It isn't mentioned in sysinstall or porters handbook either, so this patch removes the only place it is mentioned.
Responsible Changed From-To: freebsd-ports-bugs->portmgr Portmgr territory
State Changed From-To: open->closed Part of recent bsd.port.mk patchset (forgot to close the PR)