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inspect-library: Parse ELF header to check for version definitions

As noted on !491 (merged), we could make inspect-library more robust as follows:

  • if there is a verdef SOME_VERSION@SOME_VERSION in the .symbols file:
    • parse the ELF header looking for the verdefs section
    • if SOME_VERSION is found, OK
    • else, flag an issue about the missing version definition
    • if there is no verdefs section at all, perhaps flag a different issue about the library being unversioned

There's code in libcapsule/utils/library-cmp.c to do something very similar.

To do this, we would have to link libelf into inspect-library, which means accepting that if libelf is broken or there is a missing dependency on libelf, we'll be unable to diagnose that clearly. I think that's probably OK though.