[MacPorts] #42707: mythtv-core.25: build fails on Mavericks due to missing function abs()

[MacPorts]

#42707: mythtv-core.25: build fails on Mavericks due to missing function abs()
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  Reporter:  devans@…        |      Owner:  ctreleaven@…
      Type:  defect          |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:
Resolution:                  |   Keywords:  mavericks
      Port:  mythtv-core.25  |
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Comment (by ctreleaven@…):

 Update for mythtv-core.25 to follow.  The new source code patch is adapted
 from a commit that went into 0.27 recently.  (If I was really curious, I'd
 go find out why 0.26 _isn't_ affected.  But I'm not that curious!)  Also
 fix livecheck while there.

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Ticket URL: <https://trac.macports.org/ticket/42707#comment:4>
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