[MacPorts] #38356: gmock: update to 1.6.0

[MacPorts]

#38356: gmock: update to 1.6.0
--------------------------+-----------------------------
 Reporter:  ryandesign@…  |      Owner:  josephholsten@…
     Type:  update        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.1.3
 Keywords:  haspatch      |       Port:  gmock
--------------------------+-----------------------------
 gmock 1.6.0 is available; the port should probably be updated.

 Here is a patch. It fails at destroot with this message:

 {{{
 'make install' is dangerous and not supported. Instead, see README for how
 to integrate Google Test into your build system.
 }}}

 So somebody will have to figure out what this means and how to fix this.

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