[MacPorts] #49789: upgrade xcode on mavericks buildbot builder tennine-slave to latest version, 6.2

[MacPorts]

#49789: upgrade xcode on mavericks buildbot builder tennine-slave to latest
version, 6.2
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 Reporter:  ryandesign@…    |      Owner:  admin@…
     Type:  enhancement     |     Status:  new
 Priority:  Normal          |  Milestone:
Component:  server/hosting  |    Version:
 Keywords:                  |       Port:
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 xcode on the mavericks buildbot builder tennine-slave is currently 5.1.1.
 it should be upgraded to the latest version for mavericks, which according
 to XcodeVersionInfo is 6.2. the command line developer tools need to be
 updated at the same time.

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Ticket URL: <https://trac.macports.org/ticket/49789>
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