[MacPorts] #29214: xcodeversion portgroup: Don't fail if Xcode.app can't be found

[MacPorts]

#29214: xcodeversion portgroup: Don't fail if Xcode.app can't be found
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 Reporter:  eturro@…          |       Owner:  macports-tickets@…                   
     Type:  defect            |      Status:  new                                  
 Priority:  Normal            |   Milestone:                                       
Component:  ports             |     Version:  1.9.2                                
 Keywords:                    |        Port:  xcodeversion                         
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Comment(by eturro@…):

 I understand there are complications. My point is simply that checking the
 existence of /Developer/Applications/Xcode.app is an unreliable proxy for
 checking that the system meets all the requirements for building ports.
 This is likely to become more of a problem as SSDs become more prevalent
 and disk space more precious and people are forced to delete files they
 don't use. In my experience, literally everything in /Developer except for
 Xcode.app (whose existence some ports check) can be deleted and ports will
 continue to build fine. If anyone can think of a better proxy for checking
 that a system meets the requirements for building ports, this would be
 welcome.

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Ticket URL: <https://trac.macports.org/ticket/29214#comment:2>
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