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mktime: improve heuristic for ca-1986 Indiana DST
This patch syncs mktime.c from Gnulib, fixing a problem reported by Mark Krenz <https://bugs.gnu.org/48085>, and it should fix BZ#29035 too. * time/mktime.c (__mktime_internal): Be more generous about accepting arguments with the wrong value of tm_isdst, by falling back to a one-hour DST difference if we find no nearby DST that is unusual. This fixes a problem where "1986-04-28 00:00 EDT" was rejected when TZ="America/Indianapolis" because the nearest DST timestamp occurred in 1970, a temporal distance too great for the old heuristic. This also also narrows the search a bit, which is a minor performance win. (cherry picked from commit 83859e1)
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