[MacPorts] #53909: port diagnose fails in xcode-select

[MacPorts]

#53909: port diagnose fails in xcode-select
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  Reporter:  janstary  |      Owner:
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  base      |    Version:  2.4.99
Resolution:            |   Keywords:
      Port:            |
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Comment (by janstary):

 The problem seems to be in the check_for_clt{} function of diagnose.tcl:
 - if on 10.9, it looks for /Library/Developer/CommandLineTools/
 - otherwise, it tries to call "xcode-select -p"

 On MacOSX 10.6.8 with Xcodde 3.2.6, there is no "-p".
 Changing it to "xcode-select -print-path" fixes that for me here,
 but probably breaks it for someone else on other versions.

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Ticket URL: <https://trac.macports.org/ticket/53909#comment:2>
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