[MacPorts] #66622: py-bcrypt: allow build without Rust on PPC

[MacPorts]

#66622: py-bcrypt: allow build without Rust on PPC
--------------------------+-----------------------
 Reporter:  barracuda156  |      Owner:  stromnov
     Type:  defect        |     Status:  assigned
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.8.0
 Keywords:  powerpc       |       Port:  py-bcrypt
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 The portfile currently does not use Rust for Python 3.5 and earlier,
 however on PPC there is no Rust at the moment. It should be allowed to
 build without Rust on PPC.

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Ticket URL: <https://trac.macports.org/ticket/66622>
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