[MacPorts] #46704: php-uuid: add php56 subport

[MacPorts]

#46704: php-uuid: add php56 subport
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 Reporter:  ryandesign@…  |      Owner:  pixilla@…
     Type:  update        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.3.99
 Keywords:  haspatch      |       Port:  php-uuid
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 `5.6` should be added to `php.branches` in the php-uuid port. It builds
 fine for me.

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Ticket URL: <https://trac.macports.org/ticket/46704>
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