[MacPorts] #51998: update py-pylint to 1.6.4 ; new dependencies -> add ports py-isort and py-backports-functools_lru_cache

[MacPorts]

#51998: update py-pylint to 1.6.4 ; new dependencies -> add ports py-isort and py-
backports-functools_lru_cache
---------------------------+--------------------------------
 Reporter:  ottenr.work@…  |      Owner:  macports-tickets@…
     Type:  update         |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  ports          |    Version:
 Keywords:                 |       Port:  py-pylint
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 attached is a patch for the py-pylint port to update it to version 1.6.4.
 I am not sure why the statement "file delete
 ${destroot}${python.pkgd}/logilab/__init__.py" would be necessary, it
 seems to work for me without doing this.

 I have also updated the dependencies, which required two new ports "py-
 isort" (sll versions) and "py-backports-functools_lru_cache" (only for
 py27) - these new Portfiles are also attached.

 I am not sure whether this should be submitted in three different tickets
 since they are all related... Please let me know the preferred/proper way
 of handling this for future events!

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Ticket URL: <https://trac.macports.org/ticket/51998>
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