libc/glibc: LinuxThreads are no longer supported in latest versions

In fact, it is only supported in a few legacy versions.

Keep LT available for all eglibc versions, although it might need
a similar safeguard...

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>

# Compute s390-specific values

CT_DoArchTupleValues() {

    # That's the only thing to override

    if [ "${CT_ARCH_64}" = "y" ]; then

        CT_TARGET_ARCH="s390x"

    fi

}