Removing untested libpcap support for older platforms

[Guy Harris <gharris () sonic net>]

The MS-DOS support in libpcap was recently removed in the main branch; the comment for the pull request is "MSDOS 
packet driver interface is no longer testable", and the comment for the first commit is "MSDOS packet driver interface 
is no longer testable, anyone needs it can use a previous version".

We've also removed support for older versions of the Linux kernel in recent releases.

We now also require C99 support by the compiler and library.

Should we also consider removing support for some older UN*X platforms, such as:

        SunOS prior to SunOS 4 - pcap-nit.c; the last such version, SunOS 3.5, was released in January 1988

        SunOS 4.x - pcap-snit.c; the last such version, SunOS 4.1.5, was released in November 1994

        HP-UX 9 - some code in pcap-dlpi.c;  the last such version, 9.10, was released in early-to-mid 1995

        HP-UX 10 prior to 10.20 - some code in pcap-dlpi.c; - the only such version, 10.0, was released in 1995

        SINIX - some code in pcap-dlpi.c; - the last release, Reliant UNIX 5.45, was released some time in the early 
2000s (?)

        IRIX - pcap-snoop.c; - the last update was released some time in the mid-to-late 2000s (?)

        DEC OSF/1^W^WDigital UNIX^WTru64 UNIX - pcap-pf.c; the last release, Tru64 UNIX 5.1B-6, was released in October 
2010

(release information from that famously reliable site, Wikipedia:

        https://www.theonion.com/wikipedia-celebrates-750-years-of-american-independence-1819568571

and some Google searching).

We don't have any buildbots doing tests of those platforms, and I don't know when the last test of whether libpcap will 
compile or work on those platforms was done.

However, there may well be people using them - pull request #1203:

        https://github.com/the-tcpdump-group/libpcap/pull/1203

was a change to fix libpcap so that it builds on Mac OS X 10.4, the last version of which, 10.5.8, was released on 
August 13, 2009.

So the questions are:

        1) Which of these have a significant user base?

        2) Which of them have a user base willing to provide a buildbot so that we check for code rot?

(Note that users in group 1) but not in group 2) are at risk of code rot either rendering libpcap unbuildable or making 
the result of the compile not work correctly.)
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