[PATCH] Remove all uses of mallinfo(3)

Hi all,
  with the advent of 64-bit systems, which arguably are now most of our
install base, mallinfo(3) has started to show its age. According to comment
threads in various mailing lists, that library call is old, not really
portable, and will not be updated to 64-bit cleanliness even on Linux/glibc
systems. Our user mailing list has more examples of it causing confusion
due to 32/64 bit wrapping than helping people out.
This patch removes all references to mallinfo from the code.

If all the patches I just posted are +1-ed for inclusion, they can all be
merged in one go from the lp:~kinkie/squid/sbrk-removal feature-branch.

Thanks

-- 
    Francesco