[MacPorts] #17615: Only convert receipts if it's actually needed

[MacPorts]

#17615: Only convert receipts if it's actually needed
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 Reporter:  jmr@…             |       Owner:  macports-tickets@…                   
     Type:  enhancement       |      Status:  new                                  
 Priority:  Normal            |   Milestone:  MacPorts base enhancements           
Component:  base              |     Version:  1.8.0                                
 Keywords:                    |        Port:                                       
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Comment(by blb@…):

 Should we just test for ${prefix}/var/macports/.mprename or use something
 else?

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Ticket URL: <http://trac.macports.org/ticket/17615#comment:1>
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