Bug#956947: ogre-1.12 build depends on cruft package swig3.0

[Adrian Bunk]

Source: ogre-1.12
Version: 1.12.4+dfsg1-5
Severity: serious
Tags: ftbfs

swig3.0 is no longer being built by src:swig,
and the cruft package in unstable is not in bullseye.