Test/A08time fails if there's no terminal

[Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>]

Something other than "read -t0.1" is needed for the delay here.

Pattern match failed, line mismatch (1/2):
 <(0|[1-9][0-9]#000)ns (0|[1-9][0-9]#000)ns
 >not interactive and can't open terminal
 >33000ns 159000ns
Test ./A08time.ztst failed: error output differs from expected as
shown above f\or:
  ( TIMEFMT='%nU %nS'; time (read -k3 -t0.1) )
Was testing: TIMEFMT %nU and %nS are limited to microsecond precision