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rc: only have single instance of a symbol, extern in header (thanks mcf)

--- a/code.c

+++ b/code.c

@@ -7,7 +7,7 @@

 #define	c1	t->child[1]

 #define	c2	t->child[2]

 code *codebuf;

-int codep, ncode, codeline;

+static int codep, ncode, codeline;

 #define	emitf(x) ((codep!=ncode || morecode()), codebuf[codep].f = (x), codep++)

 #define	emiti(x) ((codep!=ncode || morecode()), codebuf[codep].i = (x), codep++)

 #define	emits(x) ((codep!=ncode || morecode()), codebuf[codep].s = (x), codep++)

--- a/exec.c

+++ b/exec.c

@@ -4,6 +4,11 @@

 #include "io.h"

 #include "fns.h"

+char *argv0="rc";

+io *err;

+int mypid;

+thread *runq;

+

 /*

  * Start executing the given code at the given pc with the given redirection

  */

@@ -216,8 +221,6 @@

  * fabricate bootstrap code and start it (*=(argv);. -bq /usr/lib/rcmain $*)

  * start interpreting code

  */

-char *argv0="rc";

-

 void

 main(int argc, char *argv[])

 {

--- a/exec.h

+++ b/exec.h

@@ -57,16 +57,17 @@

 	char *status;			/* status for Xpipewait */

 	thread *ret;			/* who continues when this finishes */

 };

-

-thread *runq;

+extern thread *runq;

 void turfstack(var*);

+extern int mypid;

+extern int ntrap;			/* number of outstanding traps */

+extern int trap[NSIG];			/* number of outstanding traps per type */

+

 code *codecopy(code*);

-code *codebuf;				/* compiler output */

+extern code *codebuf;			/* compiler output */

 extern int ifnot;

-int ntrap;				/* number of outstanding traps */

-int trap[NSIG];				/* number of outstanding traps per type */

 struct builtin{

 	char *name;

 	void (*fnc)(void);

@@ -82,5 +83,3 @@

 char *srcfile(thread*);

 char *getstatus(void);

-

-extern char *argv0;

--- a/io.h

+++ b/io.h

@@ -5,7 +5,6 @@

 	unsigned char *buf, *bufp, *ebuf;

 	io	*next;

 };

-io *err;

 io *openiofd(int), *openiostr(void), *openiocore(void*, int);

 void pchr(io*, int);

--- a/rc.h

+++ b/rc.h

@@ -123,9 +123,8 @@

 void setvar(char*, word*), freevar(var*);

 #define	NVAR	521

+extern var *gvar[NVAR];		/* hash for globals */

-var *gvar[NVAR];				/* hash for globals */

-

 #define	new(type)	((type *)emalloc(sizeof(type)))

 void *emalloc(long);

@@ -132,8 +131,6 @@

 void *erealloc(void *, long);

 char *estrdup(char*);

-int mypid;

-

 /*

  * Glob character escape in strings:

  *	In a string, GLOB must be followed by *?[ or GLOB.

@@ -152,10 +149,10 @@

 #define fourbyte(c)	(((c)&0xf8)==0xf0)

 #define xbyte(c)	(((c)&0xc0)==0x80)

-extern char **argp;

-extern char **args;

+extern char *argv0;

 extern int nerror;		/* number of errors encountered during compilation */

 extern int doprompt;		/* is it time for a prompt? */

+extern io *err;

 /*

  * Which fds are the reading/writing end of a pipe?

@@ -166,3 +163,4 @@

 #define	PRD	0

 #define	PWR	1

 extern char Rcmain[], Fdprefix[];

+extern char *Signame[];

--- a/subr.c

+++ b/subr.c

@@ -1,5 +1,4 @@

 #include "rc.h"

-#include "exec.h"

 #include "io.h"

 #include "fns.h"

--- a/trap.c

+++ b/trap.c

@@ -2,7 +2,9 @@

 #include "exec.h"

 #include "fns.h"

 #include "io.h"

-extern char *Signame[];

+

+int ntrap;

+int trap[NSIG];

 void

 dotrap(void)

--- a/var.c

+++ b/var.c

@@ -2,6 +2,8 @@

 #include "exec.h"

 #include "fns.h"

+var *gvar[NVAR];

+

 int

 hash(char *s, int n)

 {