[MacPorts] #63239: Bug in mpv portfile

[MacPorts]

#63239: Bug in mpv portfile
----------------------------+--------------------
  Reporter:  gaming-hacker  |      Owner:  (none)
      Type:  defect         |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.7.1
Resolution:                 |   Keywords:  bug
      Port:  mpv            |
----------------------------+--------------------
Description changed by gaming-hacker:

Old description:

> Is
> ```
> waf.python.branch ${python.branch}
> ```
>
> should be
> ```
> set waf.python.branch ${python.branch}
> ```

New description:

 Is


 ```
 waf.python.branch ${python.branch}
 ```

 should be


 ```
 set waf.python.branch ${python.branch}
 ```

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Ticket URL: <https://trac.macports.org/ticket/63239#comment:1>
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