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swig: fix incremental build in case of removed interface files

felix schwitzer requested to merge felixsch/cmake:swig-broken-dependency-scan into master

!354 (merged) introduced automatic dependency scanning for files %included in a swig interface definition file. This works fine as long as no such file is removed. But removing a dependent file breaks an incremental build and make complains about a missing dependency, see #16830.

Integrate the approach proposed in the issue above into the SWIG-module.

Fixes: #17433 (closed).

Edited by Brad King

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