URLs should be updated from http to https

[Vincent Lefevre]

For both lzip and plzip, URLs should be updated from http to https.

For instance,

  http://www.gnu.org/licenses/

should be changed to

  https://www.gnu.org/licenses/

-- 
Vincent Lefèvre <vinc...@vinc17.net> - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / Pascaline project (LIP, ENS-Lyon)