useless cast warning

Hi!

When compiling emacs git head on NetBSD, I see:

getopt1.c: In function 'rpl_getopt_long':
getopt1.c:31:34: warning: useless cast to type 'char **' [-Wuseless-cast]
   31 |   return _getopt_internal (argc, (char **) argv, options, long_options,
      |                                  ^
getopt1.c: In function 'rpl_getopt_long_only':
getopt1.c:54:34: warning: useless cast to type 'char **' [-Wuseless-cast]
   54 |   return _getopt_internal (argc, (char **) argv, options, long_options,
      |                                  ^

 Thomas