[rfc] Fix header in gdb.gdbtk

[Markus Deuling]

Hi,

some tests in gdb.gdbtk/ fail on x86 because some headers are missing. This patch
adds those.

Btw, why is there a separate ChangeLog? 

Ok to commit?


ChangeLog:

	* simple.c: Inlude <stdlib.h> and <string.h> for declarations of
	malloc and strncpy.
	* stack1.c: Inlucde <stdlib.h> for a declaration of exit.


-- 
  Markus Deuling
  GNU Toolchain for Linux on Cell BE
  deuling@de.ibm.com

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