Fix "warning: conflicting types for ‘zend_multibyte_set_script_encoding’ due to enum/integer mismatch;"

[youkidearitai]

Related: #13122

I found return type mismatch and displays warning when GCC 13 on Ubuntu 23.10.

/home/tekimen.linux/src/youkidearitai_php-src/Zend/zend_multibyte.c:173:22: warning: conflicting types for ‘zend_multibyte_set_script_encoding’ due to enum/integer mismatch; have ‘zend_result(const zend_encoding **, size_t)’ {aka ‘ZEND_RESULT_CODE(const struct _zend_encoding **, long unsigned int)’} [-Wenum-int-mismatch]
  173 | ZEND_API zend_result zend_multibyte_set_script_encoding(const zend_encoding **encoding_list, size_t encoding_list_size)
      |                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /home/tekimen.linux/src/youkidearitai_php-src/Zend/zend_globals.h:39,
                 from /home/tekimen.linux/src/youkidearitai_php-src/Zend/zend_compile.h:773,
                 from /home/tekimen.linux/src/youkidearitai_php-src/Zend/zend_multibyte.c:21:
/home/tekimen.linux/src/youkidearitai_php-src/Zend/zend_multibyte.h:73:14: note: previous declaration of ‘zend_multibyte_set_script_encoding’ with type ‘int(const zend_encoding **, size_t)’ {aka ‘int(const struct _zend_encoding **, long unsigned int)’}
   73 | ZEND_API int zend_multibyte_set_script_encoding(const zend_encoding **encoding_list, size_t encoding_list_size);
      |              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

[SakiTakamachi]

It looks like it was probably left out of the fix.

[SakiTakamachi]

cc: @devnexen

[devnexen]

Thanks for your keen eye.