Using the Sparc port as precedent, this patch fixes the use of 
CALL_DUMMY_BREAKPOINT_OFFSET to be multi-arch compatible.  It's a bit of a 
hack, so I may well come back to it at a later date.

2002-02-18  Richard Earnshaw  <rearnsha@arm.com>

	* arm-tdep.c (arm_set_call_dummy_breakpoint_offset): New function.
	(arm_fix_call_dummy): Call it.
	(arm_call_dummy_breakpoint_offset): Delete.
	(arm_gdbarch_init): Initialize call_dummy_breakpoint_offset.
	* config/arm/tm-arm.h (CALL_DUMMY_BREAKPOINT_OFFSET): Delete.