[MacPorts] #63529: opencolorio: fix compatibility with yaml-cpp-0.7.0

[MacPorts]

#63529: opencolorio: fix compatibility with yaml-cpp-0.7.0
--------------------------+--------------------
  Reporter:  devernay     |      Owner:  (none)
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.7.1
Resolution:               |   Keywords:
      Port:  opencolorio  |
--------------------------+--------------------

Comment (by devernay):

 OK, now I have a few minutes!
 I pushed a PR with the above fix: https://github.com/macports/macports-
 ports/pull/12467

-- 
Ticket URL: <https://trac.macports.org/ticket/63529#comment:3>
MacPorts <https://www.macports.org/>
Ports system for macOS