[MacPorts] #68583: balsa: update to 2.6.4

[MacPorts]

#68583: balsa: update to 2.6.4
---------------------------+--------------------
 Reporter:  contextnerror  |      Owner:  (none)
     Type:  update         |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  ports          |    Version:
 Keywords:  haspatch       |       Port:  balsa
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 Partial portfile, existing patches should be done. I think I've done all I
 can here.

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Ticket URL: <https://trac.macports.org/ticket/68583>
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