Description:
------------
Running the built-in webserver with an explicit webroot (-t
option) causes the router script to be looked up relative to the
webroot, but not to the CWD as before.

Apparently, this regression has been introduced when fixing bug
#75287[1].

[1] <http://git.php.net/?p=php-src.git;a=commit;h=816758eda2bcdd69ba505fb6bbb79124a7bf2254>


Test script:
---------------
cd
cat router.php
start php -S localhost:8080 -t www router.php
wget -qO- http://localhost:8080


Expected result:
----------------
c:\php-sdk\phpmaster\vc15\x64

<?php
echo 'hi';

hi


Actual result:
--------------
c:\php-sdk\phpmaster\vc15\x64

<?php
echo 'hi';

<br />
<b>Warning</b>:  Unknown: failed to open stream: No such file or directory in <b>Unknown</b> on line <b>0</b><br />
<br />
<b>Fatal error</b>:  Unknown: Failed opening required 'C:\php-sdk\phpmaster\vc15\x64\www\router.php' (include_path='.;C:\php\pear') in <b>Unknown</b> on line <b>0</b><br />