Bug 9926 - Missing perl modules in Koha

To test:

1) check perl syntax on file
     $ perl -cw ./misc/migration_tools/koha-svc.pl

     you should *not* get 'syntax OK' returned from command

2) apply patch, and install File::Slurp module
      $ sudo cpanm File::Slurp

3) check perl syntax on file
      $ perl -cw ./misc/migration_tools/koha-svc.pl

      you should now get 'syntax OK' returned from command

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>

Comment: Without File:Slurp 1) complains of missing module,
with module then sintax Ok.
No errors.

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>
Changed module from required to optional. The two files in which
it is used are extraneous from the viewpoint of the average user.

C4/Installer/PerlDependencies.pm

@@ -674,6 +674,11 @@ our $PERL_DEPS = {
         'required' => '0',
         'min_ver'  => '3.9',
     },
+    'File::Slurp' => {
+        'usage'    => 'Command line scripts',
+        'required' => '0',
+        'min_ver'  => '9999.13',
+    },
 };
 
 1;