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Previously we were not extracting any `swiftmodule` file that was not a system or a built-in one. This was done to avoid re-extracting `swiftmodule` files that were built previously in the same build, but it turned out to be too eager, as there are legitimate cases where a non-system, non-built-in precompiled swift module can be used. An example of that is the `PackageDescription` module used in Swift Package Manager manifest files (`Package.swift`). We now relax the test and trigger module extraction on all loaded modules that do not have source files (we trigger source file extraction for those). The catch, is that we also create empty trap files for current output `swiftmodule` files (including possible alias locations set up by XCode). This means that if a following extractor run loads a previously built `swiftmodule` file, although it will trigger module extraction, this will however be skipped as it will find its target file already present (this is done via the `TargetFile` semantics).