[MacPorts] #48767: guile: re-enable universal variant

[MacPorts]

#48767: guile: re-enable universal variant
---------------------+--------------------------------
 Reporter:  ionic@…  |      Owner:  macports-tickets@…
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:  guile
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 `guile` is now (r139728) a dependency of `gdb`, which has the `universal`
 variant available.

 However, `guile`'s `universal` variant was disabled in r130525 due to
 merge conflicts.

 {{{
 Error: Cannot install gdb for the archs 'i386 x86_64' because
 Error: its dependency guile does not build for the required archs by
 default
 Error: and does not have a universal variant.
 }}}

 We should probably find a way to make `guile` build `universal` again.

 For now, I will be removing `guile` as a dependency of `gdb`, because it's
 optional.

-- 
Ticket URL: <https://trac.macports.org/ticket/48767>
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