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

[tcpdump] / tests / pim_header_asan-3.out

    1  2028-06-24 22:58:08.999999 IP (tos 0x0, ttl 47, id 40445, offset 0, flags [+, DF, rsvd], proto PIM (103), length 8744, bad cksum a (->9c6e)!)
    22.3.2.7 > 54.0.0.249: PIMv2, length 8724
        Register, cksum 0x0e00 (unverified), Flags [ none ]
         [|pimv2]