libgcc unwinder on aarch64 fails to keep track of Pointer Authentication state
and may try to authenticate return addresses that were not signed causing a
runtime crash.

Upstream report: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94514

Patch sent upstream:
https://gcc.gnu.org/pipermail/gcc-patches/2020-April/543641.html

For the record, the kernel currently allows userspace Pointer Authentication,
but AFAIK, all SUSE/openSUSE packages are compiled _without_ this feature.
Nevertheless, users can compile their own packages with this feature enabled.
Only ARMv8.3 (and later) hardware are affected.