perl 3.0 patch #41 (combined patch)

perl 3.0 patch #41 (combined patch)

Here's the requisite dinky patch to fix the problems of the
preceding large set of patches.  In this case, a couple of
malloc/free problems--one of which involved overrunning the end
of an allocated string, and the other of which involved freeing
with invalid pointers.  (There was also a bug in there involving
variable magicalness propagating incorrectly, which resulting in
a dbm anomoly.)

I updated README to mention that dnix needs to avoid -O.

I added the hp malloc union overhead strut that Jan Dr{rv posted.
(Eventually this should be determined by Configure, but laziness
has its advantages.)