ZP-645 Revert "PHP 5.4+ ob_start() needs an extra flag to allow".

Released under the Affero GNU General Public License (AGPL) version 3.

This reverts commit 074cc4b9.
extra flag is not needed as it's the default value

src/index.php

@@ -43,13 +43,7 @@
 * Consult LICENSE file for details
 ************************************************/
 
-
-if (version_compare(phpversion(), '5.4.0') < 0) {
-    ob_start(null, 1048576);
-}
-else {
-    ob_start(null, 1048576, PHP_OUTPUT_HANDLER_STDFLAGS);
-}
+ob_start(null, 1048576);
 
 // ignore user abortions because this can lead to weird errors - see ZP-239
 ignore_user_abort(true);