Autoconf: Print the GNU C Library version when needed in autogen.sh

[tcpdump] / tests / tcp-handshake-nano-ttt.out

    1   00:00:00.000000000 IP 131.155.215.69.46656 > 137.116.81.94.80: tcp 0
    2   00:00:00.127521774 IP 137.116.81.94.80 > 131.155.215.69.46656: tcp 0
    3   00:00:00.000087895 IP 131.155.215.69.46656 > 137.116.81.94.80: tcp 0