Fix compiler warning with GCC 16: assignment discards 'const' qualifier from pointer target type [-Werror=discarded-qualifiers]

Author: arnaud-lb

ext/mysqlnd/mysqlnd_connection.c

@@ -550,7 +550,7 @@ MYSQLND_METHOD(mysqlnd_conn_data, get_scheme)(MYSQLND_CONN_DATA * conn, MYSQLND_
 			/* IPv6 without square brackets so without port */
 			transport.l = mnd_sprintf(&transport.s, 0, "tcp://[%s]:%u", hostname.s, port);
 		} else {
-			char *p;
+			const char *p;
 
 			/* IPv6 addresses are in the format [address]:port */
 			if (hostname.s[0] == '[') { /* IPv6 */

ext/mysqlnd/mysqlnd_wireprotocol.c

@@ -459,7 +459,7 @@ php_mysqlnd_greet_read(MYSQLND_CONN_DATA * conn, void * _packet)
 			packet->auth_protocol = estrdup("");
 		} else {
 			/* Check if NUL present */
-			char *null_terminator = memchr(p, '\0', remaining_size);
+			const char *null_terminator = memchr(p, '\0', remaining_size);
 			size_t auth_protocol_len;
 			if (null_terminator) {
 				/* If present, do basically estrdup */