[MacPorts] #42456: ROOT : Update to 5.34.15

[MacPorts]

#42456: ROOT : Update to 5.34.15
---------------------------------+--------------------------------
 Reporter:  jonesc@…             |      Owner:  macports-tickets@…
     Type:  update               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.2.1
 Keywords:  haspatch maintainer  |       Port:  root
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 Bump ROOT to 5.34.15

 Upstream has also switch the default GUI to a native Cocoa version for OSX
 10.8 and newer, so to stay consist this patch does the same. The Cocoa
 backend seems much more stable now in my tests, and also works when ROOT
 is imported via python (Previously a stumbling block, as it didn't work).
 So making it the default now seems reasonable...

 Chris

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Ticket URL: <https://trac.macports.org/ticket/42456>
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