[Dev] [PATCH] Update Iceweasel to 76.0-2

[grizzlyuser]

Please find change descriptions in commit messages from the
attached patches.

iceweasel_branding_76.0-1.patch should be applied to [1] and
includes changes from the version 75 which for some reason
didn't make their way into the git repo.

Built for x86_64. Video calls work in Jitsi Meet, please see
[2].

Although I updated the patches and installed testing versions of
clang and rust for i686, and checked there are nothing to merge
from armv7h, builds both architectures failed with different
kinds of errors. Might want to look at them later.

[1] https://git.parabola.nu/packages/iceweasel.git/ [2]
https://labs.parabola.nu/issues/2767
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