[imp] upgrade of php and new error

[Ian Miller]

I just upgraded php on our server and on the test.php page a new error message 
appeared in the PEAR section.
I am running 
horde 2.2.3
imp 3.2.1
truba 1.2
with 
apache 2.0.48 
and 
PHP 4.3.4




    * Unknown error: main(): Failed opening 'Mail/mimeDecode.php' for inclusion
(include_path='.:/usr/local/lib/php') (/www/htdocs/horde/test.php:194)