traceroute: Modernize time functions.

[Collin Funk]

I mentioned using more modern time functions in a previous mail and then
forgot about it.

I've applied this patch using modern gnulib timespec functions instead
of rolling our own versions (atleast for traceroute).

Also, Bruno Haible mentioned in gnulib that inet_ntoa only works for
IPv4 [1]. For some reason I forgot about this limitation. It would be
nice to move to inet_ntop everywhere at some point.

In a similar vein, should probably get rid of gethostbyname and
gethostbyaddr. They were marked obsolete in POSIX 2001 and removed in
POSIX 2008. Perhaps I will find time to do that and improve the
getaddrinfo gnulib module.

Collin

[1] https://lists.gnu.org/archive/html/bug-gnulib/2024-06/msg00268.html

0001-traceroute-Modernize-time-functions.patch
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