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Import changes from IMath versions (1.3, 1.29].
Upstream fixed bugs over the years, but none are confirmed to have
affected pgcrypto. We're better off naively tracking upstream than
reactively maintaining a twelve-year-old snapshot of upstream. Add a
header comment describing the synchronization procedure. Discard use of
INVERT_COMPARE_RESULT(); the domain of the comparisons in question is
{-1,0,1}, controlled entirely by code in imath.c.
Andrew Gierth reviewed the Makefile change. Tom Lane reviewed the
synchronization procedure description.
Discussion: https://postgr.es/m/20190203035704.GA6226@rfd.leadboat.com
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