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fix timezone parser code crashing on 64bit sys
if sizeof(time_t) == 8, this code path was missing the correct offset into the zoneinfo file, using the header magic to do offset calculations. the 6 32bit fields to be read start at offset 20.
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@ -176,7 +176,7 @@ static void do_tzset()
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if (map) {
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int scale = 2;
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if (sizeof(time_t) > 4 && map[4]=='2') {
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size_t skip = zi_dotprod(zi, VEC(1,1,8,5,6,1), 6);
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size_t skip = zi_dotprod(zi+20, VEC(1,1,8,5,6,1), 6);
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trans = zi+skip+44+20;
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scale++;
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} else {
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