search: fix rt: w/ approxidate when TZ != UTC

While git respects a user's local timezone and returns
seconds-since-the-Epoch, we were unnecessarily and incorrectly
calling gmtime+strftime on its result.  So ignore calling
gmtime+strftime when the strftime format is "%s", just feed
the output time from git directly to Xapian.

This is mainly for lei, which will likely run in a variety of
timezones.  While we're at it, add a recommendation to use
TZ=UTC in public-inbox-httpd, in case there are (misguided :P)
sysadmins who set a non-UTC TZ.

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