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   Update to firefox 71.0.

   See https://www.mozilla.org/en-US/firefox/71.0/releasenotes/
   Fixes https://www.mozilla.org/en-US/security/advisories/mfsa2019-36/

   - Adds unveil support (cf #1580271): firefox can now only access files
     from /tmp & ~/Download by default, as chrome does
   - pledge the gpu process (cf #1580268)
   - overhaul pledge configuration which now lives in root-owned files and
     can be overriden in /etc/firefox, cf #1584839.
   - fix sound with unveil by disabling sndio lazy loading, cf #1596546

   most of the work done by jcs@, upstreaming by yours truly - this has
   been commited to firefox 72, but backport it to 71 so that it gets wider
   testing. See /usr/local/share/doc/pkg-readmes/firefox for configuration
   changes.

   Note that security.sandbox.pledge.main & security.sandbox.pledge.content
   about:config keys are now useless.

   Add 3 patches to fix the build with upcoming rust 1.39, from semarie@.

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