Disable bootstrap.php checks when HHVM is used

tests/bootstrap.php

@@ -6,9 +6,11 @@ if ($configDir) {
 	define('PHPUNIT_CONFIG_DIR', $configDir);
 }
 
-if(version_compare(phpversion(), '5.6.0', '>=') &&
-	ini_get('always_populate_raw_post_data') !== '-1') {
-	throw new Exception("'always_populate_raw_post_data' has to be set to '-1' in your php.ini");
+if (!defined('HHVM_VERSION')) {
+	if(version_compare(phpversion(), '5.6.0', '>=') &&
+		ini_get('always_populate_raw_post_data') !== '-1') {
+		throw new Exception("'always_populate_raw_post_data' has to be set to '-1' in your php.ini");
+	}
 }
 
 require_once __DIR__ . '/../lib/base.php';