[MacPorts] #44771: subversion-perlbindings: add perl 5.18 and 5.20 support

[MacPorts]

#44771: subversion-perlbindings: add perl 5.18 and 5.20 support
--------------------------+-------------------------------------
 Reporter:  ryandesign@…  |      Owner:  dluke@…
     Type:  update        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.3.99
 Keywords:  haspatch      |       Port:  subversion-perlbindings
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 This patch adds 5.18 and 5.20 to the supported perl versions. I also made
 an incidental change to a string comparison (use `eq` instead of `==` and
 use curly braces around variable names). Lastly, I changed the default
 perl version from 5.12 to 5.16 to match the rest of MacPorts.

 The 5.18 subport builds for me, but the 5.20 doesn't:

 {{{
 make: *** No rule to make target `install-swig-pl-lib'.  Stop.
 }}}

 Could you investigate and fix? This blocks other updates I'm wanting to
 commit.

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Ticket URL: <https://trac.macports.org/ticket/44771>
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