Merge branch 'alxu/procps-pwait'

New command, pwait! Waits for another process to finish just like
pgrep finds or pkill kills another process.

References:
 procps-ng/procps!97

Signed-off-by: Craig Small <csmall@dropbear.xyz>

diff --cc NEWS
index 96a668cd8734e507300ce6b4d0a285d9883ad006,96a668cd8734e507300ce6b4d0a285d9883ad006..67bc486bb5c5ace33fd7eaac6d80d023b6550677
--- 1/NEWS
--- 2/NEWS
+++ b/NEWS
@@@ -8,6 -8,6 +8,7 @@@ procps-ng NEX
    * pidof: show worker threads                             Redhat #1803640
    * ps.1: Mention stime alias                              issue #164
    * ps: check also match on truncated 16 char comm names
++  * pwait: New command waits for a process                 merge #97
    * sysctl: Match systemd directory order                  Debian #950788
    * sysctl: Document directory order                       Debian #951550
    * top: ensure config file backward compatibility         Debian #951335