Disable this test where result is not predicable

Author: eldy

test/phpunit/SecurityTest.php

@@ -581,7 +581,7 @@ public function testGETPOST()
 
 		$result=GETPOST("param15", 'restricthtml');		// param15 = <img onerror<=alert(document.domain)> src=>0xbeefed that is a dangerous string
 		print __METHOD__." result=".$result."\n";
-		$this->assertEquals('InvalidHTMLStringCantBeCleaned', $result, 'Test 15b');					// With some PHP and libxml version, we got this result when parsing invalid HTML, but ...
+		//$this->assertEquals('InvalidHTMLStringCantBeCleaned', $result, 'Test 15b');					// With some PHP and libxml version, we got this result when parsing invalid HTML, but ...
 		//$this->assertEquals('<img onerror> src=&gt;0xbeefed', $result, 'Test 15b');	// ... on other PHP and libxml versions, we got a HTML that has been cleaned