[MacPorts] #62788: openmpi: opportunistically uses zlib; add formal dependency and configure flag

[MacPorts]

#62788: openmpi: opportunistically uses zlib; add formal dependency and configure
flag
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 Reporter:  mascguy  |      Owner:  mascguy
     Type:  defect   |     Status:  assigned
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:  openmpi
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 When port `zlib` is already installed, OpenMPI opportunistically utilizes
 it. Otherwise, it builds its own internally.

 For consistency, add a formal lib dependency on `zlib`, and add configure
 argument `--with-zlib=${prefix}`.

 While not an urgent issue - this has likely been the case for years - it
 should still be fixed.

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Ticket URL: <https://trac.macports.org/ticket/62788>
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