Description:
------------
Since upgrading from PHP 5.1.4 to PHP 5.1.5 on a Windows system that was previously working, mysqli does not load.

Apache 2.0.59
PHP 5.1.5
MySQL 5.0.22
phpMyAdmin 2.8.2

I have also tried with MySQL 5.0.24 -> same problem.

After reverting to PHP 5.1.4, mysqli loads fine.

Expected result:
----------------
The file php_mysqli.dll (16-Aug-2006) appears in the C:\PHP5\ext\ directory, as it should.

The php.ini is set to load extensions as follows (and this is unchanged from PHP 5.1.4, which worked fine here):
  ...
extension_dir = "C:\PHP5\ext\"
  ...
extension=php_gd2.dll
extension=php_mbstring.dll
extension=php_mysql.dll
extension=php_mysqli.dll
extension=php_xsl.dll
  ...

Actual result:
--------------
The Apache error.log says the following each time Apache is restarted:

  PHP Warning:  PHP Startup: Unable to load dynamic 
  library 'C:\\PHP5\\ext\\php_mysqli.dll' - The specified
  procedure could not be found.\r\n in Unknown on line 0


PHP loads otherwise, and phpMyAdmin works but gives the following error on its homepage:

  Cannot load mysqli extension. Please check your PHP
  configuration.