[MacPorts] #34618: swig: add swig-php53 and swig-php54 subports

[MacPorts]

#34618: swig: add swig-php53 and swig-php54 subports
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 Reporter:  ryandesign@…             |       Owner:  kevin@…           
     Type:  enhancement              |      Status:  new               
 Priority:  Normal                   |   Milestone:                    
Component:  ports                    |     Version:  2.1.1             
 Keywords:                           |        Port:  swig              
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 Currently there is a swig-php5 subport, which depends on
 path:bin/php:php5. The php5 and php5-devel ports are going away, and
 ${prefix}/bin/php will no longer be installed by a port. php5 and
 php5-devel are to be replaced by the new php53 and php54 subports, which
 install ${prefix}/bin/php53 and ${prefix}/bin/php54 respectively. I'm not
 sure how swig works, but I assume we should have new swig-php53 and swig-
 php54 ports, which let you build something for use with php53 and php54
 respectively.

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Ticket URL: <https://trac.macports.org/ticket/34618>
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