Added a "const".

committer: mfx <mfx> 974916065 +0000

src/mygetopt.cpp

@@ -530,7 +530,7 @@ static int _getopt_internal (int argc, char **argv, const char *optstring,
 
   {
     char c = *nextchar++;
-    char *temp = my_index (optstring, c);
+    const char *temp = my_index (optstring, c);
 
     /* Increment `optind' when we start to process its last character.  */
     if (*nextchar == '\0')