Bug 16442: Make C4::Ris plack safe

Bug 16442: Make C4::Ris plack safe

C4::Ris incorrectly uses 4 package variables:
- $utf: not used, can be removed
- $intype: set to marcflavour once, but later it assumes that it is
  usmarc if not defined
- $marcprint: always 0, so set it to 0
- $protoyear: only used in 1 subroutine, let's define it at this
  level

Test plan:
Just make sure the RIS export works as before this patch

Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Brendan Gallagher <brendan@bywatersolutions.com>
(cherry picked from commit 87b181c6d40e7a811fee511648ddd3cb7d44c4e4)
Signed-off-by: Frédéric Demians <f.demians@tamil.fr>
(cherry picked from commit a987ff3ba92e1558e11a63335895749b5efd1689)
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>