Hide the 'MOREARGS' macro, it conflicts with contrib code, and is only used in one file.

PR:		211818
Reported by:	Mark Millard <markmi AT dsl-only.net>
MFC after:	2 weeks

sys/powerpc/include/frame.h

@@ -109,7 +109,5 @@ struct callframe {
 /* Definitions for syscalls */
 #define	FIRSTARG	3				/* first arg in reg 3 */
 #define	NARGREG		8				/* 8 args in regs */
-#define	MOREARGS(sp)	((caddr_t)((uintptr_t)(sp) + \
-    sizeof(struct callframe) - 3*sizeof(register_t))) /* more args go here */
 
 #endif	/* _MACHINE_FRAME_H_ */

sys/powerpc/powerpc/trap.c

@@ -80,6 +80,9 @@ __FBSDID("$FreeBSD$");
 #define	FAULTBUF_CR	22
 #define	FAULTBUF_R14	3
 
+#define	MOREARGS(sp)	((caddr_t)((uintptr_t)(sp) + \
+    sizeof(struct callframe) - 3*sizeof(register_t))) /* more args go here */
+
 static void	trap_fatal(struct trapframe *frame);
 static void	printtrap(u_int vector, struct trapframe *frame, int isfatal,
 		    int user);