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

[MacPorts]

#67197: libopenraw: add a legacy option for system without Rust
---------------------------+-------------------------------------------
  Reporter:  barracuda156  |      Owner:  mascguy
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.8.1
Resolution:                |   Keywords:  powerpc, leopard, snowleopard
      Port:  libopenraw    |
---------------------------+-------------------------------------------

Comment (by MarcusCalhoun-Lopez):

 Assuming everything is working properly, PowerPC systems are the only ones
 without Rust.\\
 If the [https://github.com/macports/macports-
 ports/pull/18205/commits/44dc178ab2ddea89d8bd7c5774b86037cae2798a pull
 request] that adds the cargo_fetch PG is merged, libopenraw should work
 back to 32-bit 10.5.

-- 
Ticket URL: <https://trac.macports.org/ticket/67197#comment:2>
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