Fix use-after-free in stream freeing during shutdown

Streams will be freed in an unpredictable order during shutdown.
Ignore explicit calls to php_stream_close() entirely to avoid
use-after-free -- instead let the stream resource destructor
deal with it. We have to account for a few special cases:

 * Enclosed streams should be freed, as the resource destructor
   will forward to the enclosing stream.
 * Stream cookies also directly free streams, because we delegate
   to the cookie destruction if one exists.
 * Mysqlnd also directly frees streams, because it explicitly
   removes stream resources (because mysqlnd!)

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