[MacPorts] #56377: Additions to the cargo PG for all cases

[MacPorts]

#56377: Additions to the cargo PG for all cases
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  Reporter:  MarcusCalhoun-Lopez                 |      Owner:  (none)
      Type:  enhancement                         |     Status:  new
  Priority:  Normal                              |  Milestone:
 Component:  ports                               |    Version:
Resolution:                                      |   Keywords:
      Port:  ripgrep fd mesalink ​racer librsvg  |
  cargo                                          |
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Comment (by raimue):

 Thank you for working on this! I am sure the support for custom build
 phases in muniversal will also help other ports. It even looks easier than
 I thought.

 Maybe `OUT_DIR` is not supported for all builds, but just by some
 applications use it in their `build.rs`. I will make a mental note to look
 into this again when I update ripgrep to get rid of the hardcoded hash in
 that port.

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Ticket URL: <https://trac.macports.org/ticket/56377#comment:3>
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