12069 Backport sh_delay() and tvsleep() from ksh-2020.0.0

Review Request #2469 — Created Dec. 10, 2019 and submitted — Latest diff uploaded

marcel
illumos-gate
master
12069
0583673...
general
This replaces the complex and buggy delay implementation in ksh sleep (aka
/usr/bin/sleep) by simple nanosleep(3C) call as could be found in the new
upstream ksh-2020.0.0.
I confirmed that /usr/bin/sleep with the newly built libast and libshell calls
nanosleep() to implement the delay.
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