[MacPorts] #66603: supported_archs noarch calls for Clang on Rosetta

[MacPorts]

#66603: supported_archs noarch calls for Clang on Rosetta
--------------------------+----------------------
 Reporter:  barracuda156  |      Owner:  kencu
     Type:  defect        |     Status:  assigned
 Priority:  Normal        |  Milestone:
Component:  base          |    Version:  2.8.0
 Keywords:                |       Port:
--------------------------+----------------------
 There is a weird bug in the base, apparently: many ports having `noarch`
 call for Clang on 10.6.x when the build is for `ppc`. Example (10.6.8
 Rosetta):
 {{{
 10:opt svacchanda$  /usr/bin/sudo port -v -n install eigen3-devel
 --->  Computing dependencies for eigen3-devel..
 Error: Cannot install clang-11 for the arch 'powerpc' because
 Error: its dependency python310 does not build for the required arch by
 default
 Error: and does not have a universal variant.
 Error: Follow https://guide.macports.org/#project.tickets if you believe
 there
 is a bug.
 Error: Processing of port eigen3-devel failed
 }}}

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Ticket URL: <https://trac.macports.org/ticket/66603>
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