mod_perl: All paths must be absolute

[Max Kanat-Alexander]

	When running under mod_perl, we can't guarantee what directory we're
currently in. So, if you specify a path, it must be absolute.

	You can use bz_locations->{'libdir'} (see Bugzilla::Constants on the
tip) to get Bugzilla's absolute path, as soon as I check in this bug:

	https://bugzilla.mozilla.org/show_bug.cgi?id=342744

	-Max
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