Fix PCRE compilation

Author: twose

ext/pcre/php_pcre.c

@@ -1610,10 +1610,10 @@ PHPAPI zend_string *php_pcre_replace_impl(pcre_cache_entry *pce, zend_string *su
 	size_t			 last_end_offset;	/* Where the last search ended */
 	char			*walkbuf,			/* Location of current replacement in the result */
 					*walk,				/* Used to walk the replacement string */
-					*match,				/* The current match */
-					*piece,				/* The current piece of subject */
-					*replace_end,		/* End of replacement string */
 					 walk_last;			/* Last walked character */
+	const char		*match,				/* The current match */
+					*piece,				/* The current piece of subject */
+					*replace_end;		/* End of replacement string */
 	size_t			result_len; 		/* Length of result */
 	zend_string		*result;			/* Result of replacement */
 	pcre2_match_data *match_data;
@@ -1849,7 +1849,7 @@ static zend_string *php_pcre_replace_func_impl(pcre_cache_entry *pce, zend_strin
 	size_t			 alloc_len;			/* Actual allocated length */
 	PCRE2_SIZE		 start_offset;		/* Where the new search starts */
 	size_t			 last_end_offset;	/* Where the last search ended */
-	char			*match,				/* The current match */
+	const char		*match,				/* The current match */
 					*piece;				/* The current piece of subject */
 	size_t			result_len; 		/* Length of result */
 	zend_string		*result;			/* Result of replacement */