memory allocation magic numbers in glibc

[SL Baur]

Wolfram Gloger <Wolfram.Gloger@dent.med.uni-muenchen.de> writes in libc-alpha@sourceware.cygnus.com:
 ...
> However, you're hitting the `1024 mmap'ed chunks' limit, which you
> shouldn't hit with the latest malloc (glibc-2.1.91 and up).  I think
> it's a bug in thread-m.h (patch forthcoming!), for now you can
> hopefully work around the problem by linking with -lpthread (even
> though you're not using threads).

That's it!  Thanks.  I'll make a new version for testing when your fix
gets committed to CVS.