CMake: Fix the comment about versions. [skip ci]

[tcpdump] / tests / ipv4_invalid_total_length.out

    1  2023-08-25 08:57:44.621711 IP [total length 85 > length 84] (invalid) (tos 0x0, ttl 64, id 61862, offset 0, flags [none], proto UDP (17), length 85)
    140.211.9.206.39095 > 45.33.127.156.53: 37546+ [1au] A? www.tcpdump.org. (56)