Bug 16975 : @INC should not have '.' as its last entry

Bug 16975 : @INC should not have '.' as its last entry

To Test
1/ Try using a plugin
2/ Apply patch
3/ Test plugin still works

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Brendan Gallagher <brendan@bywatersolutions.com>
(cherry picked from commit 28eae42d2d09c14d0bb1bd3e1655714b33711ab3)
Signed-off-by: Frédéric Demians <f.demians@tamil.fr>
(cherry picked from commit 1cf1c89f304fd2d84a1264041e8834444d1c8bf3)
Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>