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cc1: Remove unused parameter in expand()

--- a/src/cmd/cc/cc1/cc1.h

+++ b/src/cmd/cc/cc1/cc1.h

@@ -487,7 +487,7 @@

 /* cpp.c */

 extern void icpp(void);

 extern int cpp(void);

-extern int expand(char *begin, Symbol *sym);

+extern int expand(Symbol *);

 extern void incdir(char *dir);

 extern void outcpp(void);

 extern void defdefine(char *macro, char *val, char *source);

--- a/src/cmd/cc/cc1/cpp.c

+++ b/src/cmd/cc/cc1/cpp.c

@@ -252,7 +252,7 @@

 }

 int

-expand(char *begin, Symbol *sym)

+expand(Symbol *sym)

 {

 	size_t elen;

 	int n, i;