Finalize the closing process of persistent streams. The current

Finalize the closing process of persistent streams. The current
behavior/API is as follows:

1) To close a persistent use php_stream_pclose(), it will close the stream
and remove it from the persistent list.

2) Inside PHP code only explicit fclose() will close persistent streams,
all other actions such as unset() or assigning a value to stream handle
will not.

3) Regular streams can still be closed by either fclose(), unset() or an
assignment of a value to the stream handler.