Description:
------------
Packing a magic file into a phar and using finfo_open(0, 'phar://test.phar/file.magic'); does not work.

Try to create the .phar with the generator script and run it. It will fail.

Test script:
---------------
<?php
$phar = new Phar('test.phar');
$phar->addFromString('test.magic', <<<'MGC'
0       string             =<?php         PHP text
!:mime  text/x-php
MGC
);
$phar->setStub(<<<'PHP'
<?php
$finfo = finfo_open(0, 'phar://' . __FILE__ . '/test.magic');
__HALT_COMPILER();
?>
PHP
);
?>


Expected result:
----------------
no error.

Actual result:
--------------
$ php-5.6.0RC1 test.phar 
PHP Warning:  finfo_open(/tmp/test/phar): failed to open stream: No such file or directory in /tmp/test/test.phar on line 2

Warning: finfo_open(/tmp/test/phar): failed to open stream: No such file or directory in /tmp/test/test.phar on line 2
PHP Warning:  finfo_open(/tmp/test/phar): failed to open stream: No such file or directory in /tmp/test/test.phar on line 2

Warning: finfo_open(/tmp/test/phar): failed to open stream: No such file or directory in /tmp/test/test.phar on line 2
PHP Warning:  finfo_open(/tmp/test/test.phar/test.magic): failed to open stream: No such file or directory in /tmp/test/test.phar on line 2

Warning: finfo_open(/tmp/test/test.phar/test.magic): failed to open stream: No such file or directory in /tmp/test/test.phar on line 2
PHP Notice:  finfo_open(): Warning: using regular magic file `/tmp/test/test.phar/test.magic' in /tmp/test/test.phar on line 2

Notice: finfo_open(): Warning: using regular magic file `/tmp/test/test.phar/test.magic' in /tmp/test/test.phar on line 2
PHP Warning:  finfo_open(/tmp/test/test.phar/test.magic): failed to open stream: No such file or directory in /tmp/test/test.phar on line 2

Warning: finfo_open(/tmp/test/test.phar/test.magic): failed to open stream: No such file or directory in /tmp/test/test.phar on line 2
PHP Warning:  finfo_open(): Failed to load magic database at '/tmp/test/phar:/tmp/test/test.phar/test.magic'. in /tmp/test/test.phar on line 2

Warning: finfo_open(): Failed to load magic database at '/tmp/test/phar:/tmp/test/test.phar/test.magic'. in /tmp/test/test.phar on line 2