rustc: Prevent false positives in crate loading #13017
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Previously, any library of the pattern
lib<name>-<hash>-<version>.so
wasThis is incorrect because each candidate needs to be validated to actually
contain a rust library (valid metadata). This commit alters the logic to filter
each set of candidates for a hash to only libraries which are actually rust
libraries. This means that if multiple false positives are found with the right
name pattern, they're all ignored.
Closes #13010