gcc-8: arm64/kvm/pauth.: Error: unknown architectural extension `pauth'

[Naresh Kamboju]

The arm64 defconfig build failed with gcc-8 and passed with gcc-13.

Reported-by: Linux Kernel Functional Testing <lkft at linaro.org>

Build log:
---
/tmp/ccSUNNZy.s: Assembler messages:
/tmp/ccSUNNZy.s:3159: Error: unknown architectural extension `pauth'
make[5]: *** [scripts/Makefile.build:244: arch/arm64/kvm/pauth.o] Error 1

Steps to reproduce:
---
# tuxmake --runtime podman --target-arch arm64 --toolchain gcc-8
--kconfig defconfig

Links:
 - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20240422/testrun/23551634/suite/build/test/gcc-8-defconfig/details/
 - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20240422/testrun/23551634/suite/build/test/gcc-8-defconfig/log
  - https://storage.tuxsuite.com/public/linaro/lkft/builds/2fRe0ZWWmise7cetIz0aXdnq4jJ/

--
Linaro LKFT
https://lkft.linaro.org