K 10
svn:author
V 7
mandree
K 8
svn:date
V 27
2020-11-30T00:27:25.575444Z
K 7
svn:log
V 438
openimageio: fix py-openimageio's version going backwards

When yuri@'s commit http://svnweb.freebsd.org/changeset/ports/555420
bumped openimageio's version, the Makefile was seeing PORTREVISION=1,
but there is a derived port, py-openimageio, which also .include-s
openimageio's Makefile.

Change this main port to set its PORTREVISION with ?= and add a
comment to remind editors.

Approved by:	portmgr@ (blanket, trivial regression fix)

END