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tests/capture-libs: Tolerate path to ld.so not being fully resolved

Simon McVittie requested to merge smcv/libcapsule:tolerate-incomplete-realpath into master

--resolve-ld.so would ideally be the equivalent of realpath or readlink -f, but in fact it only has special handling for symlinks in the last position in the pathname (like AT_SYMLINK_NOFOLLOW and O_NOFOLLOW), leading to different results on at least Arch Linux.

The pressure-vessel utility for which this option was added does not actually use it any more, so fixing this is not a high priority right now.

Edited by Simon McVittie

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