[MacPorts] #54986: swig-php: Add variants for php70, php71, make php71 the default

[MacPorts]

#54986: swig-php: Add variants for php70, php71, make php71 the default
------------------------+-----------------------
 Reporter:  ryandesign  |      Owner:  michaelld
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  swig-php
------------------------+-----------------------
 swig-php currently defaults to php55. php55 has reached end of life.
 Please add variants for php70 and php71 and make php71 the default, since
 that's the latest stable version.

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Ticket URL: <https://trac.macports.org/ticket/54986>
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