MT#7335 Get rid of (build-)dependency on pdl package

pdl seems to be unneeded (if that's wrong we should revert this
commit) nowadays.

debian/control

@@ -40,7 +40,6 @@ Build-Depends: debhelper (>= 8),
                libxml-simple-perl,
                libxml-simpleobject-libxml-perl,
                libxml-simpleobject-perl,
-               pdl,
                perl-doc,
                wml
 Standards-Version: 3.9.5
@@ -85,7 +84,6 @@ Depends: libaliased-perl,
          libxml-simple-perl,
          libxml-simpleobject-libxml-perl,
          libxml-simpleobject-perl,
-         pdl,
          perl-doc,
          wml,
          ${misc:Depends},