databases/clickhouse: fix build on CURRENT

perl5 is pulled in via llvm13 during build, but llvm14 does not
have this dependency. Leave PORTREVISION alone as no rebuilds
are required.

PR: 261561
Approved by: olevole@olevole.ru (maintainer)
Sponsored by: SkunkWerks, GmbH

(cherry picked from commit 8b0eb02c2efed83a4207860142a34605621d0e42)