mismatch between chrooted and non-chrooted paths (there are both CLI
scripts and a web app; both need to refer to the same paths and as well
as being complicated, the patches weren't quite working correctly,
as noticed by sebastia@).
Now you must setup a symlink "/var/www/var/www -> .." instead as
described in the new version of the pkg-readme, allowing icingaweb2 to
always use /var/www paths whether inside or outside the jail.
Note: Existing users of this package will need to create that symlink too.