5l, 6l, 8l: add varargck for %Z

R=golang-dev
CC=golang-dev, rsc
https://golang.org/cl/4837044

src/cmd/5l/l.h

@@ -324,6 +324,7 @@ EXTERN	Prog*	prog_modu;
 #pragma	varargck	type	"N"	Adr*
 #pragma	varargck	type	"P"	Prog*
 #pragma	varargck	type	"S"	char*
+#pragma	varargck	type	"Z"	char*
 #pragma	varargck	type	"i"	char*
 
 int	Aconv(Fmt*);

src/cmd/6l/l.h

@@ -410,6 +410,7 @@ uint32	machheadr(void);
 #pragma	varargck	type	"D"	Adr*
 #pragma	varargck	type	"P"	Prog*
 #pragma	varargck	type	"R"	int
+#pragma	varargck	type	"Z"	char*
 #pragma	varargck	type	"A"	int
 #pragma	varargck	argpos	diag 1
 

src/cmd/8l/l.h

@@ -46,10 +46,6 @@ enum
 #define	P		((Prog*)0)
 #define	S		((Sym*)0)
 #define	TNAME		(cursym?cursym->name:noname)
-#define	cput(c)\
-	{ *cbp++ = c;\
-	if(--cbc <= 0)\
-		cflush(); }
 
 typedef	struct	Adr	Adr;
 typedef	struct	Prog	Prog;
@@ -254,6 +250,7 @@ enum
 #pragma	varargck	type	"R"	int
 #pragma	varargck	type	"S"	char*
 #pragma	varargck	type	"Y"	Sym*
+#pragma	varargck	type	"Z"	char*
 #pragma	varargck	type	"i"	char*
 
 EXTERN	int32	HEADR;