perl-bioperl-core: add run-time depends on perl-db_file

This is needed for Bio::Index objects and classes that descend
from it for the creation of index files.

recipes/perl-bioperl-core/meta.yaml

@@ -13,7 +13,7 @@ source:
 # If this is a new build for the same version, increment the build
 # number. If you do not include this key, it defaults to 0.
 build:
-  number: 0
+  number: 1
   run_exports:
     weak:
       - {{ name }} ={{ version }}
@@ -42,10 +42,12 @@ requirements:
     - perl-yaml
     - perl-xml-twig
     # Required at least for testing
+    # (run-time dependency for Bio::Index and its descendants)
     - perl-db_file
 
   run:
     - perl
+    - perl-db_file
     #- perl-xml-writer
     #- perl-uri
     #- perl-xml-dom