Fix for this error > cbuffer_t.h:79:33: error: 'size_t' has not been declared

[jspaces]

When I tried to compile svn #6592M; I get this following error:
utils/cbuffer_t.h:79:33: error: 'size_t' has not been declared

I found by adding:
#include <stdlib.h>

The compiled completed without further error.

[kierongreen]

Many thanks - incorporated in 6593.