utc_offset() was broken with year's first/last day if struct tm.tm_gmtoff didn't exist.
utc_offset() was broken with year's first/last day if struct tm.tm_gmtoff didn't exist.

--HG--
branch : HEAD

dscho/dovecot,dscho/dovecot,dscho/dovecot,dscho/dovecot,dscho/dovecot