scripts/internals: fix stripping once more

Some scripts have 'very long lines', so the output of 'file'
will have that mentioned, such as:
POSIX shell script, ASCII text executable, with very long lines

Reported-by: Kyle Grieb <grieb.kyle@gmail.com>
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

}