[cvs-nhc98] patch applied (nhc98): #ifdef to decide whether to use sbrk() or malloc() to allocate the heap.

[Malcolm Wallace]

Tue Feb  6 07:32:30 PST 2007  Malcolm.Wallace at cs.york.ac.uk
  * #ifdef to decide whether to use sbrk() or malloc() to allocate the heap.
  The sbrk() route was to avoid getting a high-mem heap on Linux.
  But sbrk() breaks MacOS X builds, so use original malloc() on that platform.

    M ./src/runtime/Kernel/collector.c -1 +5