[RFA]: Fix libgloss/m68hc11/syscalls.c build pb

[Stephane Carrez]

Hi!

The sbrk() definition is not correct in m68hc11 implementation and it does not
compile any more (I guess this is because sbrk prototype was fixed in newlib <sys/unistd.h>).

Can you approve this patch?

Thanks,
	Stephane

2002-10-19  Stephane Carrez  <stcarrez@nerim.fr>

	* m68hc11/syscalls.c (sbrk): Use ptrdiff_t for increment parameter.
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