[MacPorts] #36037: bitlbee: use conflicts_build

[MacPorts]

#36037: bitlbee: use conflicts_build
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 Reporter:  ryandesign@…             |       Owner:  yeled@…           
     Type:  enhancement              |      Status:  new               
 Priority:  Normal                   |   Milestone:                    
Component:  ports                    |     Version:  2.1.2             
 Keywords:  haspatch                 |        Port:  bitlbee           
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 This patch updates bitlbee to use the new conflicts_build option.

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Ticket URL: <https://trac.macports.org/ticket/36037>
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