[MacPorts] #62239: readline is erroneously marked as not being able to install +universal

[MacPorts]

#62239: readline is erroneously marked as not being able to install +universal
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 Reporter:  jordanhubbard  |      Owner:  (none)
     Type:  defect         |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  ports          |    Version:
 Keywords:                 |       Port:
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 root at mighty-> port install emacs
 --->  Computing dependencies for emacs
 Error: Cannot install gdbm for the archs 'arm64 x86_64' because
 Error: its dependency readline cannot build for the required archs.
 Error: Follow https://guide.macports.org/#project.tickets to report a bug.

 I have, however, built readline just fine as an arm64 library, so I'm not
 sure where it is flagged as unbuildable for this arch combination (I also
 looked at the readline/Portfile and I don't see any limitations flagged
 there).  Not sure what's up with this, but as readline is a very key leaf
 port, it is probably worth fixing.

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Ticket URL: <https://trac.macports.org/ticket/62239>
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