Bug 6679 - [SIGNED-OFF] fix 2 perlcritic violations in C4/Print.pm

Bug 6679 - [SIGNED-OFF] fix 2 perlcritic violations in C4/Print.pm

Bareword file handle opened at line 80, column 9.  See pages 202,204 of PBP.  (Severity: 5)

Two-argument "open" used at line 80, column 9.  See page 207 of PBP.  (Severity: 5)

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
http://perldoc.perl.org/functions/open.html
For three or more arguments if MODE is |- , the filename is interpreted
as a command to which output is to be piped, and if MODE is -| , the
filename is interpreted as a command that pipes output to us. I

Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>