[MacPorts] #47025: poppler: add Qt5 subport and optional test support.

[MacPorts]

#47025: poppler: add Qt5 subport and optional test support.
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  Reporter:  rjvbertin@…  |      Owner:  devans@…
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:  haspatch
      Port:  poppler      |
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Comment (by rjvbertin@…):

 I'd actually forgotten that I've added an experimental variant to my own
 version of this port that preserves existing runtime shared libraries
 (libpoppler.53.dylib in my case) so that I don't have to rebuild a couple
 of *huge* dependents each time the ABI is broken. I'm keeping that bit to
 myself of course :)

 So, I've refreshed my patch. The actual part for the Qt5 subport hasn't
 changed. I put the suppression of the main libs in a loop, in the Qt
 subport post-destroot as that makes upgrading just a bit more streamlined.
 More importantly, I've added a dependency on port:curl because the
 configure script will build support for libcurl-based HTTP when libcurl is
 detected. The feature can be turned off, but I think that curl is
 installed almost by definition so there is probably little benefit to
 disabling it.

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Ticket URL: <https://trac.macports.org/ticket/47025#comment:29>
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