Includes fixes for CVE-2021-43536, CVE-2021-43537, CVE-2021-43538,
CVE-2021-43539, CVE-2021-43541, CVE-2021-43542, CVE-2021-43543,
CVE-2021-43545, CVE-2021-43546, and MOZ-2021-0009.
* gnu/packages/gnuzilla.scm (%icecat-version, %icecat-build-id): Update.
(icecat-source): Remove icecat-CVE-2021-43527.patch, which is now included
in upstream icecat. Update the gnuzilla commit, base version, and hashes.
* gnu/packages/patches/icecat-CVE-2021-43527.patch: Delete file.
* gnu/local.mk (dist_patch_DATA): Remove it.