Backport/write fixes for Tor Browser (ESR 31 based) cross-compile issues
While getting Tor Browser based on ESR 31 ready there showed a bunch of (cross-)compilation issues up that are not fixed yet on mozilla-central. We should write the patches and get them into Mozilla's repositories. So far we have:
https://bugzilla.mozilla.org/show_bug.cgi?id=1058778 https://bugzilla.mozilla.org/show_bug.cgi?id=1059725 https://bugzilla.mozilla.org/show_bug.cgi?id=1067893