[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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 In Mk/macports.upgrade.mk, we currently run sed on every receipt to
 replace db/dports with macports, and create a .mpsaved backup regardless
 of whether anything was replaced. It would be nice if we only did this
 when it's needed.

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