Description:
------------
As the 'checkdnsrr()' function is not implemented on a windows platform, I suggest to make it available to windows, because there are some scripts that actually use it, such as bitweaver content manager to validate a new registration via email.

I'm not going to use the most complicated operating system ever devised (Linux), just to use bitweaver.

I say, if a script requires a certain function, then it should be implemented into a windows platform for those that use windows.

Reproduce code:
---------------
elseif( $gBitSystem->isFeatureActive( 'validateUsers' ) ) {
			list ( $Username, $domain ) = split ("@",$pEmail);
			// That MX(mail exchanger) record exists in domain check .
			// checkdnsrr function reference : http://www.php.net/manual/en/function.checkdnsrr.php
			if ( checkdnsrr ( $domain, "MX" ) )  {
				if($gDebug) echo "Confirmation : MX record about {$domain} exists.<br>";
				// If MX record exists, save MX record address.

Expected result:
----------------
an implementation in windows to enable email validation

Actual result:
--------------
FATAL! call, undefined function checkdnsrr() in d:\content\users\bituser.php line 437