Remove compiler warning

sql/parse_file.h

@@ -32,7 +32,7 @@ typedef enum {
   
 struct File_option
 {
-  const LEX_STRING name;		/* Name of the option */
+  LEX_STRING name;		/* Name of the option */
   int offset;				/* offset to base address of value */
   enum file_opt_type type;		/* Option type */
 };