[MacPorts] #69522: mpv: Add libmpv

[MacPorts]

#69522: mpv: Add libmpv
------------------------------+----------------------
  Reporter:  gabrielzschmitz  |      Owner:  Ionic
      Type:  enhancement      |     Status:  assigned
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.9.1
Resolution:                   |   Keywords:
      Port:  mpv              |
------------------------------+----------------------

Comment (by i0ntempest):

 Replying to [comment:4 ryandesign]:
 > A variant is not a good way to provide a library because other ports
 cannot depend on it. Either enable the library always, or better yet make
 it a subport.

 Good point, though mpv has so many variants that adding a subport just for
 the library is kind of hard. I don't know if there's a way to build the
 library only, worst case I might need to manually delete some stuff after
 destroot.

-- 
Ticket URL: <https://trac.macports.org/ticket/69522#comment:6>
MacPorts <https://www.macports.org/>
Ports system for macOS