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awk: remove dead declerations

https://github.com/onetrueawk/awk/commit/64f6da6a14ca7896718aa30bd564029e59bac6cf
https://github.com/onetrueawk/awk/commit/099a6591ed9fe126cfbfcfd5fdd2f0516f29192a

--- a/sys/src/cmd/awk/awk.h

+++ b/sys/src/cmd/awk/awk.h

@@ -18,8 +18,6 @@

 #define	FOPEN_MAX	40	/* max number of open files */

-extern	char	errbuf[];

-

 extern int	compile_time;	/* 1 if compiling, 0 if running */

 extern int	safe;		/* 0 => unsafe, 1 => safe */

@@ -123,7 +121,6 @@

 #define	NIL	((Node *) 0)

 extern Node	*winner;

-extern Node	*nullstat;

 extern Node	*nullnode;

 /* ctypes */

--- a/sys/src/cmd/awk/proto.h

+++ b/sys/src/cmd/awk/proto.h

@@ -34,9 +34,6 @@

 extern	int	input(void);

 extern	void	unput(int);

 extern	void	unputstr(char *);

-extern	int	yylook(void);

-extern	int	yyback(int *, int);

-extern	int	yyinput(void);

 extern	void	*compre(char *);

 extern	int	hexstr(char **);

@@ -140,7 +137,6 @@

 extern	Cell	*relop(Node **, int);

 extern	void	tfree(Cell *);

 extern	Cell	*gettemp(void);

-extern	Cell	*field(Node **, int);

 extern	Cell	*indirect(Node **, int);

 extern	Cell	*substr(Node **, int);

 extern	Cell	*sindex(Node **, int);

-- 

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