[MacPorts] #50488: Adding shared lib building in gflags port

[MacPorts]

#50488: Adding shared lib building in gflags port
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 Reporter:  carles.fernandez@…  |      Owner:  macports-tickets@…
     Type:  enhancement         |     Status:  new
 Priority:  Normal              |  Milestone:
Component:  ports               |    Version:  2.3.4
 Keywords:  shared libs         |       Port:  gflags
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 Gflags 2.1.2 does not build libgflags.dylib by default; the flag
 -DBUILD_SHARED_LIBS=ON should be passed to CMake. I'm attaching a patch
 that builds both the static and shared versions.

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Ticket URL: <https://trac.macports.org/ticket/50488>
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