Please support clang-13
LKFT building s390 clang builds supports only clang-13. Please enable clang-13 support when it is ready.
ref: make --silent --keep-going --jobs=8 O=/home/tuxbuild/.cache/tuxmake/builds/current ARCH=s390 CROSS_COMPILE=s390x-linux-gnu- 'HOSTCC=sccache clang' 'CC=sccache clang' defconfig
*** Compiler is too old. *** Your Clang version: 12.0.1 *** Minimum Clang version: 13.0.0
scripts/Kconfig.include:44: Sorry, this compiler is not supported.