[MacPorts] #44719: Add port cantera

[MacPorts]

#44719: Add port cantera
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  Reporter:  macports@…  |      Owner:  macports-tickets@…
      Type:  submission  |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.1
Resolution:              |   Keywords:
      Port:  cantera     |
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Comment (by mf2k@…):

 A few more things:
  - You are using the default $distname and so that line should be deleted.
  - You reference "$prefix" and "$destroot" in a few places. Those should
 be "${prefix}" and "${destroot}". I don't know enough TCL to know the
 difference, but all other ports do it this way.

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Ticket URL: <https://trac.macports.org/ticket/44719#comment:13>
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