graphics/opencoloriov1: unbreak the port's build in C++17 mode

While here, expand COMMENT, drop `localbase:ldflags' from USES,
tight up the `post-install' recipe (trim some useless commands,
wrap overly long lines), pacify stage Q/A report.

Reported by:	pkg-fallout

graphics/opencoloriov1: the port had been resurrected^Wreadded.

Cleanup dependencies of blender-lts28

graphics/opencoloriov1 and graphics/openimageio-ociov1 were created to
provide old library versions to support the blender-lts28 port which has
been deleted after EOL.

PR:		268477
Reported by:	Shane <FreeBSD@ShaneWare.Biz> (maintainer)

Remove WWW entries moved into port Makefiles

Commit b7f05445c00f has added WWW entries to port Makefiles based on
WWW: lines in pkg-descr files.

This commit removes the WWW: lines of moved-over URLs from these
pkg-descr files.

Approved by:		portmgr (tcberner)

Add WWW entries to port Makefiles

It has been common practice to have one or more URLs at the end of the
ports' pkg-descr files, one per line and prefixed with "WWW:". These
URLs should point at a project website or other relevant resources.

Access to these URLs required processing of the pkg-descr files, and
they have often become stale over time. If more than one such URL was
present in a pkg-descr file, only the first one was tarnsfered into
the port INDEX, but for many ports only the last line did contain the
port specific URL to further information.

There have been several proposals to make a project URL available as
a macro in the ports' Makefiles, over time.

graphics/opencoloriov1: copy from graphics/opencolorio (+)

Prepare to import OCIOv2.
Adjust to install all as non-conflicting with main library.

Updating opencolorio port to 2.1.0 breaks several ports.
this provides a temporary fix while ports can be updated.

PR:	260309
Sponsored by:	Netzkommune GmbH.