gethrxtime: remove incorrect overflow detection
This is part of a patch written by Bruno Haible: https://lists.gnu.org/r/bug-gnulib/2019-12/msg00192.html * lib/xtime.h (xtime_make): Remove attempt to prevent internal integer overflow, as it didn’t suffice. This reverts the xtime.h part of 2018-10-12T04:46:09Zfirstname.lastname@example.org, which I cannot now see the need for anyway (even in cases where it works), as the patch is helpful only when the signs of S and NS disagree, and all callers pass nonnegative values for S and NS. Instead, add a comment saying args should be nonnegative.
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