Debian packaging: depend on libfile-spec-perl or recent perl-base version

Perl 5.20 provides the module which was shipped via libfile-spec-perl so far:
https://packages.qa.debian.org/libf/libfile-spec-perl/news/20140927T163912Z.html

So either depend on libfile-spec-perl OR an according fresh perl-base package.

debian/control

@@ -25,7 +25,7 @@ Build-Depends: debhelper (>= 8),
                libemail-mime-perl,
                libemail-sender-perl,
                libemail-valid-perl,
-               libfile-spec-perl (>= 3.4000~),
+               libfile-spec-perl (>= 3.4000~) | perl-base (>= 5.20.0-60~),
                libfile-type-perl,
                libgd-gd2-perl,
                libgeography-countries-perl,