Since there is no guarantee applications will run with the same malloc
implementation we tested against, and the cost of always ensuring the
size passed to malloc is non-zero is minimal now, stop testing it, and
default the answer to yes.

Still allows builders to override when they have complete control over
which malloc implementation will be used.

Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Part-of: <!9>