Do the case-insensitive comparisons in a locale-independent fashion that
only maps ASCII letters, in the standard English-language fashion; that
way, we don't get bitten by, for example, Turkish having separate "i
with dot" and "i without dot" letters, with lower-case "i with dot" being
mapped to upper-case "I with dot" rather than being mapped to "I".
Remove lots of $Header's and a few $Id's that all belong to the former
CVS repository of tcpdump itself. These keywords have been frozen since
the migration to git in late 2008.
the declaration of "utimes()" collides with the declaration that SunOS
5.5.1 and later, at least, *do* have. (5.5.1 doesn't declare
"snprintf()", even though it has "snprintf()", so we declare it here; we
declare some others that don't cause problems.)
