Fix warning triggered by enforcing const on function names table.

eval.c

@@ -316,12 +316,12 @@ void varinit(void)
  *
  * @fname: name of function to evaluate.
  */
-static char *gtfun( char *fname) {
+static const char *gtfun( char *fname) {
 	unsigned fnum ;				/* index to function to eval */
 	char *arg1 ; 				/* value of first argument */
 	char *arg2 ; 				/* value of second argument */
 	char *arg3 ;				/* last argument */
-	char *retstr ;				/* return value */
+	const char *retstr ;				/* return value */
 	int	low, high ;				/* binary search indexes */
 
 	/* look the function up in the function table */
@@ -1206,7 +1206,7 @@ int is_it_cmd( char *token) {
  *
  * char *token;		token to evaluate
  */
-char *getval(char *token)
+const char *getval(char *token)
 {
 	int status;	/* error return */
 	struct buffer *bp;	/* temp buffer pointer */

eval.h

@@ -19,7 +19,7 @@ int is_it_cmd( char *token) ;
 
 void varinit( void) ;
 int setvar( int f, int n) ;
-char *getval( char *token) ;
+const char *getval( char *token) ;
 int stol( char *val) ;
 char *mklower( char *str) ;
 

exec.c

@@ -348,7 +348,6 @@ boolean gettokval( char *tok, int size) {
 
 char *getnewtokval( void) {
 	char *tmpbuf ;
-	char *tmpval ;
 	char *valbuf ;
 
     /* grab token and advance past */
@@ -357,7 +356,7 @@ char *getnewtokval( void) {
 		return NULL ;
 
     /* evaluate it */
-    tmpval = getval( tmpbuf) ;
+    const char *tmpval = getval( tmpbuf) ;
     valbuf = malloc( strlen( tmpval) + 1 ) ;
     if( valbuf != NULL)
 		strcpy( valbuf, tmpval) ;