[MacPorts] #61503: improve warning message when command line tools are out of date

[MacPorts]

#61503: improve warning message when command line tools are out of date
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 Reporter:  wlipa        |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  base         |    Version:  2.6.4
 Keywords:               |       Port:
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 As seen in https://trac.macports.org/ticket/61458 I was confused by the
 advice given by the warning message when the command line tool SDK was out
 of date.  It states to run xcode-select --install, but this is not
 sufficient sometimes.

 How about changing it to:

 Warning: You can install it as part of the Xcode Command Line Tools
 package by running `xcode-select --install'.  In some cases, you may need
 to remove /Library/Developer/CommandLineTools before doing so.

 I think this would reduce confusion and support overhead.

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Ticket URL: <https://trac.macports.org/ticket/61503>
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