(ml_readline, readline): Removed const from the declaration.

@@ -318,7 +318,7 @@ extern int ml_got_interrupt __P ((void));
 extern void ml_clear_interrupt __P ((void));
 extern void ml_readline_init __P ((void));
 extern int ml_reread __P ((const char *prompt, char **text));
-extern char *ml_readline __P((const char *prompt));
+extern char *ml_readline __P((char *prompt));
 
 extern char *alias_expand __P ((char *name));
 extern void alias_destroy __P ((char *name));
@@ -335,7 +335,7 @@ char *compose_header_get __P((compose_env_t *env, char *name,
 void compose_destroy __P((compose_env_t *env));
 
 #ifndef HAVE_READLINE_READLINE_H
-extern char *readline __P ((const char *prompt));
+extern char *readline __P ((char *prompt));
 #endif
 
 #ifndef _PATH_SENDMAIL

@@ -169,7 +169,7 @@ ml_readline_internal ()
 }
 
 char *
-ml_readline (const char *prompt)
+ml_readline (char *prompt)
 {
   if (interactive)
     return readline (prompt);
@@ -529,7 +529,7 @@ ml_reread (const char *prompt, char **text)
 }
 
 char *
-readline (const char *prompt)
+readline (char *prompt)
 {
   if (prompt)
     {