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

[MacPorts]

#29214: 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:                                       
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 In the age of expensive SSDs, many of us like to delete /Developer (10GB!)
 after having installed Xcode. AFAIK, MacPorts don't need anything in
 /Developer. Most ports issue a warning if /Developer has been removed:
 "Warning: Xcode does not appear to be installed; most ports will likely
 fail to build", after which the port proceeds to being successfully built.
 zlib, however, does its own manual check to see if Xcode.app exists and
 fails with an error "Error: Couldn't find Xcode; expected it to be at
 /Developer/Applications/Xcode.app". Could you please change the code so
 zlib behaves like other ports (i.e. issues a warning but doesn't quit with
 an error).

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