[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
 Keywords:              |       Port:
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 As the configure script now calls bzip2 directly, having BZIP2 set during
 configure (as required to explicitly set the BZIP2 path for MP to use)
 causes bzip2 (when run by configure) to fail, as bzip2 uses $BZIP2 as an
 argument:
 https://www.opensource.apple.com/source/bzip2/bzip2-16.5/bzip2/bzip2.txt )

 I set BZIP2 to call my own installed pbzip2 (because it makes anything
 locally compressed and then extracted -- for example during port
 activations -- go faster.) This actually works because pbzip2 doesn't use
 BZIP2. But setting the BZIP2 path via {{{./configure
 BZIP2=/usr/bin/bzip2}}} or {{{BZIP2=/usr/bin/bzip2 ./configure}}} will
 fail on a fresh copy (or distclean-ed) of base.

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