[MacPorts] #53636: gflags @2.1.2_1 Update to 2.2.0

[MacPorts]

#53636: gflags @2.1.2_1 Update to 2.2.0
--------------------+--------------------
 Reporter:  jiawen  |      Owner:
     Type:  update  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:  cmake   |       Port:  gflags
--------------------+--------------------
 gflags is currently at 2.1.2 and has bugs in its cmake package that
 prevent apps from correctly linking against it using the simple
 instructions found on their homepage. Version 2.2.0, released in November
 2016 (https://github.com/gflags/gflags/releases/tag/v2.2.0), fixes this
 bug. Please update.

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Ticket URL: <https://trac.macports.org/ticket/53636>
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