[MacPorts] #53971: php-igbinary update to support php7

[MacPorts]

#53971: php-igbinary update to support php7
-------------------------+--------------------------
 Reporter:  chrisminett  |      Owner:
     Type:  update       |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:  php7         |       Port:  php-igbinary
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 Current version of `php-igbinary` is 1.2.1, available for php5.x

 Latest version is 2.0.3, which supports php5.x and php7.x

 By modifying the version number and checksums in the Portfile, it installs
 and works fine for me (macOS 10.12.4, php 7.1.3) but only by adding new
 `master_sites` and `distfiles` keywords to download from their Github
 repo. Not sure of the correct behaviour here (can't find anything in the
 guide), so that an up-to-date distfile can be added.

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Ticket URL: <https://trac.macports.org/ticket/53971>
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