malloc patch for 2.2.4

[Wolfram Gloger]

> Do you use threads?  In this case, this is not surprising.  fork()
> does not work well with threads and may result in odd behavior.

Huh?  POSIX has a well-defined fork() even with threads.  My test case

  http://www.malloc.de/tests/fork-malloc.c

is conforming AFAICT.  Anyway, the problem occurs even if the fork()ed
child does just an exit(0)!

Regards,
Wolfram.