[MacPorts] #40703: Sort env vars and print one per line

[MacPorts]

#40703: Sort env vars and print one per line
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 Reporter:  ryandesign@…  |      Owner:  macports-tickets@…
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:  MacPorts Future
Component:  base          |    Version:  2.2.0
 Keywords:                |       Port:
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 In debug output, I often want to see what value an environment variable is
 set to, but it's hard to find the right variable because they're all
 printed in a single long wrapped line and in random order.

 This patch prints one per line and in sorted order.

 Any objections?

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Ticket URL: <https://trac.macports.org/ticket/40703>
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