ports/115730: bsd.port.mk: extract Perl stuff

[Gabor Kovesdan]

>Number:         115730
>Category:       ports
>Synopsis:       bsd.port.mk: extract Perl stuff
>Confidential:   no
>Severity:       non-critical
>Priority:       high
>Responsible:    freebsd-ports-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          change-request
>Submitter-Id:   current-users
>Arrival-Date:   Wed Aug 22 18:50:01 GMT 2007
>Closed-Date:
>Last-Modified:
>Originator:     Gabor Kovesdan
>Release:        FreeBSD 6.2-STABLE i386
>Organization:
n/a
>Environment:
System: FreeBSD freefall.freebsd.org 6.2-STABLE FreeBSD 6.2-STABLE #0: Fri Jul 13 03:43:15 UTC 2007 peter at freefall.freebsd.org:/usr/obj/usr/src/sys/FREEFALL i386
>Description:

(It seems the previous PR was caught by the spam filter, thus I won't attach
 the patches directly this time.)

http://kovesdan.org/patches/perlmk-mk.diff
http://kovesdan.org/patches/perlmk-ports.diff

Changelog:
- Extract Perl stuff from bsd.port.mk into bsd.perl.mk
- Implement versioned Perl knobs
- Use versioned Perl knobs in ports
- Remove old Perl support from ports
- Deprecate ports that only work with old unsupported Perl versions and set
  EXPIRATION_DATE for them (I have been thinking if it is correct to do so w/o
  talking to the respective maintainers, but at all I don't see any reason in
  keeping these and there are only 3-4 ones. On request, I will roll back this
  part of the patch.)

Sponsored by: Google Summer of Code 2007 

This PR deprecates ports/55515.

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