[MacPorts] #50277: gflags @2.0 updates to 2.1.2 and moved to GitHub

[MacPorts]

#50277: gflags @2.0 updates to 2.1.2 and moved to GitHub
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 Reporter:  cornelius.howl@…  |      Owner:  macports-tickets@…
     Type:  update            |     Status:  new
 Priority:  High              |  Milestone:
Component:  ports             |    Version:  2.3.4
 Keywords:                    |       Port:
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Ticket URL: <https://trac.macports.org/ticket/50277>
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