Rather than having a tool in the FreeBSD base system for obtaining
the FreeBSD ports tree, users are encouraged to `pkg install git`
and then `git clone https://git.FreeBSD.org/ports.git /usr/ports`.

The portsnap servers will continue operating until FreeBSD 13 reaches
its End-of-Life, and portsnap is available from the ports tree as
ports-mgmt/portsnap.

Requested by:	portmgr
Relnotes:	yes
Differential Revision:	https://reviews.freebsd.org/D39563
X-MFC:		no

Submitted by:	des

Portsnap uses patches opportunistically to reduce download bandwidth: It
attempts to fetch patches which could be useful, and then makes use of
whichever patches it actually gets.  (This solves the otherwise O(n^2)
issue for the server to build patches between every pair of versions.)

During the process of applying patches, portsnap prints lines of the
form "Skipping XXX-YYY (123 of 4567).\r", where the \r serves to allow
each of these (potentially many) lines to overwrite the previous one
on the console.  Unfortunately, XXX and YYY here are SHA256 hashes,
resulting in these lines wrapping on reasonable-width consoles.

Replace the hashes with abbreviations of the form "0123...cdef"
(cutting 64 characters down to 11) in order to keep lines to a
reasonable length.

The rather ugly shell code here is used to avoid forking additional
processes; it would be much cleaner using sed(1), but in my testing
the sed-based alternative increases CPU time consumption by 50%.

Requested by:	des

add it to the set of INDEX files built by portsnap.

Switch to INDEX-14 for main.

Currently, WITHOUT_PORTSNAP forces WITHOUT_FREEBSD_UPDATE because the
latter relies on phttpget, which lives inside the portsnap build bits.

Remove the dependency between these two options by moving phttpget out into
^/libexec and building/installing it if either WITH_PORTSNAP or
WITH_FREEBSD_UPDATE.

Future work could remove the conditional if it's decided that users will use
it independently of either the current in-base consumers.

Reported by:	swills
Reviewed by:	jilles, emaste
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D26255

MFC after:	3 days
Sponsored by:	The FreeBSD Foundation

add it to the set of INDEX files built by portsnap.

Switch to INDEX-13 for head/.

This is prep for pkgbase to have config files tagged as such.

Approved by:	will (mentor)
Differential Revision:	https://reviews.freebsd.org/D16554

MFC after:	2 weeks