[MacPorts] #54216: zlib +ng (and +cloudflare) accelerated variants

[MacPorts]

#54216: zlib +ng (and +cloudflare) accelerated variants
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  Reporter:  RJVB         |      Owner:  ryandesign
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:  haspatch
      Port:  zlib         |
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Comment (by raimue):

 Replying to [comment:4 RJVB]:
 > And variants make it easier for users to go back to the official version
 for whatever reason.

 I would have gone with three ports: zlib, zlib-ng, and zlib-cloudflare,
 all fulfilling the `path:lib/libz.dylib:zlib` depspec. Then you would also
 not have any problem with different version numbers. Switching between
 those just requires a simple `port activate`, which is even easier than
 switching variants.

 I agree that something like `provides foo` would be better, but we just do
 not have it yet.

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Ticket URL: <https://trac.macports.org/ticket/54216#comment:5>
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