* sysdeps/m68k/add_n.S: Use ENTRY and END macros.

	* sysdeps/m68k/add_n.S: Use ENTRY and END macros.
	* sysdeps/m68k/lshift.S: Likewise.
	* sysdeps/m68k/rshift.S: Likewise.
	* sysdeps/m68k/sub_n.S: Likewise.
	* sysdeps/m68k/m68020/addmul_1.S: Likewise.
	* sysdeps/m68k/m68020/mul_1.S: Likewise.
	* sysdeps/m68k/m68020/submul_1.S: Likewise.
	* sysdeps/unix/sysv/linux/m68k/sysdep.S: Use ENTRY macro.
	[_LIBC_REENTRANT]: Don't store into global errno.
	* sysdeps/m68k/sysdep.h: New file.
	* sysdeps/unix/sysv/linux/m68k/sysdep.h: Use it.  Use the macros
	ENTRY, CALL_MCOUNT, JUMPTARGET and syscall_error from there.
	(DO_CALL): Change to expect syscall name as argument.
	(PSEUDO): Pass syscall_name to DO_CALL.
	(SYSCALL_ERROR_HANDLER) [_LIBC_REENTRANT]: Don't store into global
	errno.