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Paul Eggert authored
This incorporates: 2015-11-05 timespec-sub: fix overflow bug; add tests 2015-11-04 intprops: revise _WRAPV macros, revert _OVERFLOW 2015-11-03 intprops: add parentheses * lib/intprops.h, lib/timespec-add.c, lib/timespec-sub.c: Copy from gnulib.
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