[ECOS] Reducing memory requirements in PPP

[Øyvind Harboe]

With the attached change, I was able to significantly reduce the memory
requirements for my PPP test application(~30% ish, from NET_MEM_USAGE =
90k to 60k). 

The problem is that the compression buffer(~4k) is allocated out of a
pool that is NET_MEM_USAGE/4 bytes in size.

This is quite interesting, since it begs the question of whether 
the current pool based allocation scheme for networking gives
the optimum memory utilisation when memory is tight.


-- 
Øyvind Harboe
http://www.zylin.com

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