Remove the deprecation notice for timegm().

The tzcode package marked it dprecated in the late 1980ies
but it is universally supported and here to stay.

Triggered by a question from Rodrigo <hruodr at gmail dot com> on misc@.
William Ahern <william at 25thandclement dot com> listed a number of
sound arguments why it shouldn't be considered deprecated, in
particular that there is no better alternative, in particular none
that is thread-safe.

While here, fix the non-standard section name "NOTES", add the
missing STANDARDS section and provide additional information in the
HISTORY section, based on inspection of C89, C11, POSIX 2008, UNIX
v4 and v5 at TUHS, Tahoe and Reno at the CSRG archives, amd the
SunOS 3.5 and 4.0 manuals on bitsavers.

Reasearch on tzcode and SunOS history done by millert@.
OK millert@ on an earlier version of this patch,
and deraadt@ agrees with the general direction.

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