[sr #110989] Improve reliability of AT_MTIME_DELAY in test suite with a loop

Follow-up Comment #2, sr#110989 (group autoconf):

No, if I understood Nick and Jacob's suggestions correctly, the idea is to
replace $am_sleep / AT_MTIME_DELAY with something like


while [ ! newer_file -nt older_file ]; do
  sleep $am_cv_filesystem_timestamp_resolution
  touch newer_file
done


But we need a Perl helper to implement that, because test -nt isn't in POSIX,
and a test implementation that does support -nt will probably be comparing
'struct timespec's directly rather than converting to 'double' first as Perl
does.  My current vague plan is to make it be a special mode of autom4te,


autom4te --ensure-newer newer_file older_file


It could also be a separate helper script like move-if-change or automake's
"missing".


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