* m68k.c (m68k_output_function_prologue,
	m68k_output_function_epilogue): Delete versions for DPX2/MOTOROLA
	and NEWS/MOTOROLA.
	* genattrtab.c: Remove dpx2 comment.
	* libgcc2.c (__enable_execute_stack): Delete versions for
	NeXT/__MACH__, __convex__, __sysV88__, __pyr__ and
	sony_news/SYSTYPE_BSD.
	* longlong.h: Delete code for __a29k__, _AM29K, __clipper__,
	__gmicro__, __i860__, __NeXT__ and __pyr__.
	* rtl.h: Remove convex comment.
	* varasm.c: Likewise.

From-SVN: r56272