[MacPorts] #38356: gmock: update to 1.6.0

[MacPorts]

#38356: gmock: update to 1.6.0
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  Reporter:  ryandesign@…  |      Owner:  josephholsten@…
      Type:  update        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.1.3
Resolution:                |   Keywords:  haspatch
      Port:  gmock         |
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Comment (by ryandesign@…):

 I was going to point out all the ports that depend on gmock... but then
 realized it's just amarok, because I just added it, and then discovered
 there's a way to turn off its use. So maybe that's what we should do for
 amarok, and delete the port.

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Ticket URL: <https://trac.macports.org/ticket/38356#comment:3>
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