[MacPorts] #37694: latexdiff @1.0.2_1 installs p5*-algorithm-diff ports for multiple perl versions

[MacPorts]

#37694: latexdiff @1.0.2_1 installs p5*-algorithm-diff ports for multiple perl
versions
-----------------------------+--------------------------------
 Reporter:  md14-macports@…  |      Owner:  macports-tickets@…
     Type:  defect           |     Status:  new
 Priority:  Normal           |  Milestone:
Component:  ports            |    Version:  2.1.2
 Keywords:  haspatch         |       Port:  latexdiff
-----------------------------+--------------------------------
 I have perl5 installed with the `+perl5_16` variant. When I upgraded to
 `latexdiff @1.0.2_1`, three versions of the `p5*-algorithm-diff` port were
 installed:

 {{{
 p5-algorithm-diff @1.190.200_3
 p5.12-algorithm-diff @1.190.200_3
 p5.16-algorithm-diff @1.190.200_3
 }}}

 The problem was introduced in r101769. The problem seems to be caused by
 latexdiff depending on `port:p5-algorithm-diff`. It seems many many other
 portfiles avoid this problem by depending on a specific perl version of
 the port instead, e.g., `port:p5.12-algorithm-diff`. The attached patch
 appears to fix the problem.

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Ticket URL: <https://trac.macports.org/ticket/37694>
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