scanner: Downgrade non-increasing version error to warning
Commit 99a72777 introduced a new error for when the 'since' version decreases. It also reset the version for messages without a version to 1. Versioning semantics in the spec files was a little under-specified and we don't want to break projects caught in this grey zone. This commits replaces previous configure.ac as the 1.4.93 tag and the final 1.5 RC.
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