Snippets for argtable2 2.13 from FreeBSD 150arm64

Sourced from https://pkg-status.freebsd.org/ampere5/data/latest-per-pkg/argtable/2.13_3/150arm64-default.log.

• ./getopt.h:109:13: warning: a function declaration without a prototype is deprecated in all versions of C and is treated as a zero-parameter prototype in C23, conflicting with a subsequent declaration [-Wdeprecated-non-prototype]
    109 |         extern int getopt();
        |                    ^
  

• arg_int.c:60:12: warning: call to undeclared library function 'isspace' with type 'int (int)'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     60 |     while (isspace(*ptr))
        |            ^
  

• arg_int.c:89:8: warning: call to undeclared library function 'toupper' with type 'int (int)'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     89 |    if (toupper(*ptr++)!=toupper(X))
        |        ^