[MacPorts] #43204: Change BZIP2 variable name for configure script

[MacPorts]

#43204: Change BZIP2 variable name for configure script
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  Reporter:  eborisch@…  |      Owner:  macports-tickets@…
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  base        |    Version:  2.2.1
Resolution:              |   Keywords:
      Port:              |
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Comment (by ryandesign@…):

 It would be more customary if the path to the bzip2 program could be
 specified by a configure argument (e.g. `--with-bzip2=...`) instead of an
 environment variable.

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Ticket URL: <https://trac.macports.org/ticket/43204#comment:1>
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