[MacPorts] #67292: port:clamav should use rust or compiler_wrapper PG (and the rust PG might be simplifiable)

[MacPorts]

#67292: port:clamav should use rust or compiler_wrapper PG (and the rust PG might
be simplifiable)
--------------------+--------------------
 Reporter:  RJVB    |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  clamav
--------------------+--------------------
 Trying to build port:clamav on my 10.9.5 system I ran into a failure
 building the components written in rust.

 I was about to give up under the assumption that my OS is too old, but
 then saw noticed the `'cc'` in the error message. On a hunch I thought
 this might be more than a mode switch (as used by libtool, for instance),
 created a couple of symlinks mapping `cc` to `${configure.cc}` and `c++`
 to `${configure.cxx}`, prepended their location to `env(PATH)` (simpler
 than guessing which `foo.env` I'd need) and the build completed!

 I assume that making `port:clamav` use the rust should fix the issue too.
 I haven't tried to verify this though; the clamav build system invokes
 `rustc` in a rather obfuscated manner.

 (BTW: does `rustc` always invoke the C compiler as `cc` by default?)

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Ticket URL: <https://trac.macports.org/ticket/67292>
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