[MacPorts] #32882: fix libpqxx build issue with clang

[MacPorts]

#32882: fix libpqxx build issue with clang
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 Reporter:  jonesc@…                  |       Owner:  macports-tickets@…                   
     Type:  update                    |      Status:  new                                  
 Priority:  Normal                    |   Milestone:                                       
Component:  ports                     |     Version:  2.0.3                                
 Keywords:  haspatch                  |        Port:  libpqxx                              
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 libpqxx does not build with flag. Attached diff forces the use of llvm.

 Chris

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Ticket URL: <https://trac.macports.org/ticket/32882>
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