Description:
------------
Although the compression tests phar_bz2.phpt and phar_gzip.phpt both pass, they actually test the PHP version of phar creation/compression and not the C version.

Tar works fine (both Phar and PharData).

NB this is with 5_3, but there's no option for that :)

Reproduce code:
---------------
<?php

$fname = dirname(__FILE__) . '/myphar.phar';
$phar = new Phar($fname);
$phar['index.php'] = '<?php echo "hello world\n"; ?>';
$phar['bulk.txt'] = str_repeat('a', 8000);
$phar->compressAllFilesGZ();
var_dump($phar->isCompressed());

?>


Expected result:
----------------
int(4096)

Actual result:
--------------
bool(false)