Use strict alignment for E500

[David Edelsohn]

	* config/rs6000/eabispe.h (TARGET_DEFAULT): Include
	MASK_STRICT_ALIGN.
	* config/rs6000/linuxspe.h (TARGET_DEFAULT): Likewise.
	* config/rs6000/rs6000.c (rs6000_override_options): Use
	MASK_STRICT_ALIGN for 8540 and 8548.  Add MASK_STRICT_ALIGN to
	POWERPC_MASKS.

Okay.

Thanks, David