[MacPorts] #54558: devtool on libstdc++ systems uses wrong branch for fetch

[MacPorts]

#54558: devtool on libstdc++ systems uses wrong branch for fetch
--------------------+---------------------
 Reporter:  gnw3    |      Owner:
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.4.1
 Keywords:          |       Port:  devtool
--------------------+---------------------
 The Portfile adjusts {{{version}}} on libstdc++ systems, but {{{branch}}}
 is left set to the old version.

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Ticket URL: <https://trac.macports.org/ticket/54558>
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