[MacPorts] #63950: rust universal build

[MacPorts]

#63950: rust universal build
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 Reporter:  catap        |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:
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 Right now MacPorts has a sort of loop:
  - rust can't be build as `+universal` because it is used pre-build
 binaries;
  - `cargo` PG makes all dependencies `universal_variant yes` by default.

 When something is depends on rust/cargo library, it fails on attempt to
 build universal build.

 Because rust is quite popular this days to make libraries, I feel that the
 right things to do is fix universal builds for cargo-rust chain.

 How? I have no idea.

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Ticket URL: <https://trac.macports.org/ticket/63950>
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