[MacPorts] #62497: udunits2: update to 2.2.28

[MacPorts]

#62497: udunits2: update to 2.2.28
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  Reporter:  Dave-Allured  |      Owner:  tenomoto
      Type:  update        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:
      Port:  udunits2      |
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Comment (by tenomoto):

 Thanks for you notice. The tarball does not include config.h.cmake and the
 instructions for Unix suggests installation with autotools. I'll commit
 the changes.

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Ticket URL: <https://trac.macports.org/ticket/62497#comment:1>
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