[MacPorts] #67197: libopenraw: add a legacy option for system without Rust

[MacPorts]

#67197: libopenraw: add a legacy option for system without Rust
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 Reporter:  barracuda156                   |      Owner:  mascguy
     Type:  defect                         |     Status:  assigned
 Priority:  Normal                         |  Milestone:
Component:  ports                          |    Version:  2.8.1
 Keywords:  powerpc, leopard, snowleopard  |       Port:  libopenraw
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 I have checked, and turns out that `libopenraw` did not always depend on
 Rust. We could add support for systems without Rust by pegging those to a
 legacy version.

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Ticket URL: <https://trac.macports.org/ticket/67197>
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