limit usage of `internal` in selfchecks to files which are being matchcompiled

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There is actually a check which is not dependent on the matchcompiler. checkRedundantNextPrevious() will detect redundant patterns when working on tokens. But I think it should be fine since such code is not being used outside of lib and I think there is no need to apply it to the test code.

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Splitting cli from lib in the scanning has the unfortunately side effect that the selfcheck is now busy with cli/cmdlineparser.cpp which is the longest file and will no longer process the lib files on the other process. That causes the selfcheck to be slower.