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>