Reading from a stream may return greater than zero, but nonetheless the
stream's EOF flag may have been set.  We have to cater to this
condition by setting the close flag for filters.

We also have to cater to that change in the zlib.inflate filter:

If `inflate()` is called with flush mode `Z_FINISH`, but the output
buffer is not large enough to inflate all available data, it fails with
`Z_BUF_ERROR`.  However, `Z_BUF_ERROR` is not fatal; in fact, the zlib
manual states: "If deflate returns with Z_OK or Z_BUF_ERROR, this
function must be called again with Z_FINISH and more output space
(updated avail_out) but no more input data, until it returns with
Z_STREAM_END or an error."  Hence, we do so.

Closes GH-6001.

* PHP-7.3:
  Update UPGRADING
  Update NEWS & UPGRADING
  Do not decode cookie names anymore
  Fix bug #79601 (Wrong ciphertext/tag in AES-CCM encryption for a 12 bytes IV)

* PHP-7.2:
  Update NEWS & UPGRADING
  Do not decode cookie names anymore
  Fix bug #79601 (Wrong ciphertext/tag in AES-CCM encryption for a 12 bytes IV)

* PHP-7.3:
  Fix #76735: Incorrect message in fopen on invalid mode

We have to log errors in `stream_opener` callbacks to the wrapper's
error log, because otherwise we may pick up an unrelated `errno` or a
most generic message.

Closes GH-6187.

* PHP-7.3:
  Fix #76943: Inconsistent stream_wrapper_restore() errors

If restoring of any not registered built-in wrapper is requested, the
function is supposed to fail with a warning, so we have to check this
condition first.

Furthermore, to be able to detect whether a built-in wrapper has been
changed, it is not sufficient to check whether *any* userland wrapper
has been registered, but rather whether the specific wrapper has been
modified.

Closes GH-6183.