[MacPorts] #37667: port lint should complain about using only md5 or sha1 checksums

[MacPorts]

#37667: port lint should complain about using only md5 or sha1 checksums
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  Reporter:  ryandesign@…  |      Owner:  macports-tickets@…
      Type:  enhancement   |     Status:  new
  Priority:  Normal        |  Milestone:  MacPorts Future
 Component:  base          |    Version:
Resolution:                |   Keywords:
      Port:                |
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Comment (by ryandesign@…):

 We want to use at least two checksum types for each distfile, so that we
 never again have a problem if hash algorithm is later found to be
 deficient in some way. We have for some time already recommended the use
 of the rmd160 and sha256 pair.

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Ticket URL: <https://trac.macports.org/ticket/37667#comment:3>
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