debian: Use perl:Depends via dh_perl instead of a hardcoded perl

debian/changelog

@@ -7,6 +7,7 @@ dpkg (1.18.11) UNRELEASED; urgency=medium
     - Remove obsolete dependency relationships, since Debian oldstable.
     - Remove update-alternatives, dpkg-divert and dpkg-statoverride
       compatibility symlinks, again.
+    - Use perl:Depends via dh_perl instead of a hardcoded perl in Depends.
   * Documentation:
     - Update custom changelog parser API support status in README.api.
     - Fix typos in docs and man pages. Thanks to Jakub Wilk <jwilk@debian.org>

debian/control

@@ -121,7 +121,7 @@ Architecture: all
 Multi-Arch: foreign
 Depends:
  ${misc:Depends},
- perl,
+ ${perl:Depends},
 Recommends:
 # Used by Dpkg::File.
  libfile-fcntllock-perl,

debian/rules

@@ -138,6 +138,7 @@ binary-indep: install
 	dh_installman -i
 	dh_link -i
 	dh_lintian -i
+	dh_perl -i
 	dh_strip -i
 	dh_compress -i
 	dh_fixperms -i