[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 larryv@…):

 If installing system-wide is not supported by upstream, is it wise for us
 to encourage it?

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Ticket URL: <https://trac.macports.org/ticket/38356#comment:2>
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