• Register p5-CGI dependency when GITWEB option is enabled [1]
• Bump PORTREVISION since GITWEB is on by default
• While here, unmute install command and make portlint happy

PR: 225358 [1]
Submitted by: Fabian Kell <fk@fabiankeil.de> [1]
MFH: 2018Q2
Sponsored by: Rubicon Communications, LLC (Netgate)