[MacPorts] #38347: latex2rtf: use -arch flags; add universal variant if possible

[MacPorts]

#38347: latex2rtf: use -arch flags; add universal variant if possible
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 Reporter:  ryandesign@…  |      Owner:  jmpp@…
     Type:  enhancement   |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.1.3
 Keywords:                |       Port:  latex2rtf
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 latex2rtf isn't using -arch flags when compiling. It should definitely use
 those (using `[get_canonical_archflags]` probably), and if possible,
 should have a universal variant.

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Ticket URL: <https://trac.macports.org/ticket/38347>
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