64 bit support for subnet mask of type 1 in quiz

When using quiz restriction by ip address, using range type 1: xxx.xxx.xxx.xxx/xx, on 64 bit CPU, result is unexpected. Add the '+' line :

+++ lib/moodlelib.php
@@ -7029,6 +7029,7 @@
if (strpos($subnet, '/') !== false)

{ /// type 1 list($ip, $mask) = explode('/', $subnet); $mask = 0xffffffff << (32 - $mask); + $mask = substr($mask,0,8); // Compatib. cpu 64 bit $found = ((ip2long($addr) & $mask) == (ip2long($ip) & $mask)); }

else if (strpos($subnet, '-') !== false) {/// type 3
$subnetparts = explode('.', $subnet);