[MacPorts] #50001: vantages: fix URL, perl dependencies, compilation on >= 10.9

[MacPorts]

#50001: vantages: fix URL, perl dependencies, compilation on >= 10.9
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 Reporter:  mojca@…                       |      Owner:  macports-tickets@…
     Type:  defect                        |     Status:  new
 Priority:  Normal                        |  Milestone:
Component:  ports                         |    Version:
 Keywords:  mavericks yosemite elcapitan  |       Port:  vantages
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 When working on #48365 I came across `vantages` with a number of issues:
   * I'm unable to find its homepage (OK, I didn't try too hard).
   * It doesn't compile on systems with `libc++`.
   * The file `/opt/local/bin/vant-setup` (and a few others) use the
 following code where dependency on `port:p5.16-term-readkey` is pretty
 much useless:
 {{{
 #!/usr/bin/perl -w

 use strict;
 use Getopt::Std;
 use File::Basename;
 use Term::ReadKey;
 }}}
 So the dependency on a Perl module should probably be a runtime one, but
 I'm sure it cannot work the way it is set up at the moment.

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Ticket URL: <https://trac.macports.org/ticket/50001>
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