[imp] require_once inside of functions are dangerous

[Earnie Boyd]

Maintainers please take note:

When using require_once for things like IMP_BASE .  
'/config/header.php' and the file has been included once already the  
second occurrence causes the $_header array to not be defined and  
errors are issued to the user.  I changed line 133 of  
lib/MIME/Headers.php substituting "require_once" with "require" to  
resolve the issue.  I only noticed the issue when reporting spam.   
Please excuse the lame report; I don't have time to chase a proper  
patch (the usual cry from users).

PHP 5.2.4-2ubuntu5.5 with Suhosin-Patch 0.9.6.2 (cli) (built: Feb 11  
2009 20:09:52)

Regards,
Earnie


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