Re: [tz] Yet more historical data for Iran

Thanks for the further data on Iran. Unfortunately the obvious patch to the "asia" file uncovered what appears to be a longstanding bug in zic.c. So I installed the attached three patches to fix this. The first patch refactors zic.c as I had trouble following its local-variable reuse, which is no longer needed with today's compilers. The second patch fixes the zic.c bug in two different ways, sort of a belt-and-suspenders thing. The third patch updates the "asia" file to reflect our latest understanding of Iran's civil time history, with a workaround to avoid the bug in zic 2022a and earlier. PS. Sorry about misspelling your name in the last commit message.