pv-adverb: Show contents of ld.so.cache if debug output is enabled
This would have helped to diagnose steamrt/tasks#357, aka steam-runtime#630. It doesn't provide a workaround for steamrt/tasks#357: I did consider adding one, but it would have been relatively "expensive" and still wouldn't always work. I think the resolution to steamrt/tasks#357 needs to be that the glibc bug needs to be fixed instead.
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pv-adverb: Fix a typo
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pv-adverb: Don't try to change LD_LIBRARY_PATH if no value was provided
In principle we could be invoked with --regenerate-ld.so.cache but without --set-ld-library-path (although pv-wrap never actually does this).
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pv-adverb: If --verbose, read back the contents of the new ld.so.cache
Helps: steamrt/tasks#357, steam-runtime#630
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Make SRT_LOG=debug activate extra output
Previously, only --verbose or PRESSURE_VESSEL_VERBOSE would have activated this.