TT#61101 Remove obsolete alternative dependencies

These have long been gone, time to cleanup.

Change-Id: I60c97a0f2c4f7685315cc160f09b811ebae69523

debian/control

@@ -4,7 +4,7 @@ Priority: optional
 Maintainer: Sipwise Development Team <support@sipwise.com>
 Build-Depends:
  debhelper (>= 10~),
- libmodule-build-perl | perl (<< 5.21.0~),
+ libmodule-build-perl,
 Standards-Version: 3.9.8
 Homepage: https://www.sipwise.com/