Revert "Fix bug #67064 in a BC safe way"

This reverts commit 1a4a9eede59b853f11e8e8b965e5f715f53da8f7.

Conflicts:
	ext/standard/array.c
	ext/standard/tests/array/bug67064.phpt
Disable restrictions regarding arrays in constants at run-time.
For the discussion around it, see the thread on the mailing list:
http://www.mail-archive.com/internals@lists.php.net/msg68245.html
Merge branch 'PHP-5.6'