[Bug 297562] math/gmp: fix build after base cd0727ec709b

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=297562

            Bug ID: 297562
           Summary: math/gmp: fix build after base cd0727ec709b
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: [email protected]
          Reporter: [email protected]
          Assignee: [email protected]
             Flags: maintainer-feedback?([email protected])

math/gmp: fix build after base cd0727ec709b

After base cd0727ec709bb54f8f82104f6113284a15dd3464 ("libc: Add
<stdio.h> C23 feature test macro"), math/gmp fails to build with errors
similar to:

  inp_str.c:63:10: warning: call to undeclared function
'__gmpz_inp_str_nowhite'; ISO C99 and later do not support implicit function
declarations [-Wimplicit-function-declaration]
     63 |   return mpz_inp_str_nowhite (x, stream, base, c, nread);
        |          ^
  ../gmp-impl.h:1782:29: note: expanded from macro 'mpz_inp_str_nowhite'
   1782 | #define mpz_inp_str_nowhite __gmpz_inp_str_nowhite
        |                             ^
  inp_str.c:68:1: error: conflicting types for '__gmpz_inp_str_nowhite'
     68 | mpz_inp_str_nowhite (mpz_ptr x, FILE *stream, int base, int c, size_t
nread)
        | ^
  ../gmp-impl.h:1782:29: note: expanded from macro 'mpz_inp_str_nowhite'
   1782 | #define mpz_inp_str_nowhite __gmpz_inp_str_nowhite
        |                             ^
  inp_str.c:63:10: note: previous implicit declaration is here
     63 |   return mpz_inp_str_nowhite (x, stream, base, c, nread);
        |          ^
  ../gmp-impl.h:1782:29: note: expanded from macro 'mpz_inp_str_nowhite'
   1782 | #define mpz_inp_str_nowhite __gmpz_inp_str_nowhite
        |                             ^
  1 warning and 1 error generated.

This is because mpz_inp_str_nowhite() is only declared with the right
prototype, if _GMP_H_HAVE_FILE is defined. In turn, _GMP_H_HAVE_FILE is
defined only if _STDIO_H_ is defined, as it used to be in our stdio.h.

Since base cd0727ec709bb54f8f82104f6113284a15dd3464 removed the
_STDIO_H_ macro, and replaced it with __STDC_VERSION_STDIO_H__ for C23
support, add it to the list of checks in gmp-h.in, and mini-gmp.h.

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