[MacPorts] #49810: hdf5 @1.8.16 broken configure with thread safe variant

[MacPorts]

#49810: hdf5 @1.8.16 broken configure with thread safe variant
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  Reporter:  dolfimeth@…  |      Owner:  mmoll@…
      Type:  defect       |     Status:  closed
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.3.4
Resolution:  fixed        |   Keywords:
      Port:  hdf5         |
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Comment (by dolfimeth@…):

 I realized later that a better approach might be introducing an `hl`
 variant which is enabled by default and if the user explicitly enables
 both it will fall back in the experimental section with --enable-
 unsupported.

 Attached is a new patch doing that.

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Ticket URL: <https://trac.macports.org/ticket/49810#comment:3>
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