Description:
------------
ZipArchive::php_zip_extract_file and ZipArchive::extractTo call 
php_stream_stat_path to determine if a specific directory exists.  Since it 
doesn't set STREAM_URL_STAT_QUIET, warnings may be emitted in the stream's 
implementation of url_stat.  Because we are only checking for the existence of a 
directory, these warnings should be silenced.


Test script:
---------------
See http://drupal.org/node/1006302#comment-3864102

Warnings are emitted in a stream's implementation of url_stat when called from ZipArchive::extractTo.

Expected result:
----------------
No warnings should appear.

Actual result:
--------------
Backtrace of PHP warnings.  Only the two calls are shown.
Array
(
    [function] => url_stat
    [class] => DrupalLocalStreamWrapper
    [object] => DrupalTemporaryStreamWrapper Object
        (
            [context] => 
            [handle] => 
            [uri:protected] => temporary://update-extraction/apachesolr/
        )

    [type] => ->
    [args] => Array
        (
            [0] => temporary://update-extraction/apachesolr/
            [1] => 0
        )

)
Array
(
    [file] => 
/Applications/MAMP/htdocs/drupal/modules/system/system.archiver.inc
    [line] => 113
    [function] => extractTo
    [class] => ZipArchive
    [object] => ZipArchive Object
        (
            [status] => 0
            [statusSys] => 0
            [numFiles] => 41
            [filename] => /Applications/MAMP/tmp/php/update-cache/apachesolr-
7.x-1.x-dev.zip
            [comment] => 
        )

    [type] => ->
    [args] => Array
        (
            [0] => temporary://update-extraction
        )

)