Description:
------------
Till PHP 5.3.6 one could used symlinked directories for embedding certain 
extensions into a PHP build.

Example:

php-5.3.6/ext/apc -> /path/to/APC-3.1.9
php-5.3.7/ext/apc -> /path/to/APC-3.1.9

In the first case (5.3.6) ./buildconf --force used to rebuild the configuration. 
In the second case (5.3.6) it does nothing. There aren't any fs permission 
issues. That's the first thing that I checked.

Test script:
---------------
Symlink an external extension into the ext directory.
Run ./buildconf --force.

Expected result:
----------------
Reconfiguration in order to expose the new extension to the configure script.

Actual result:
--------------
Nothing relevant.