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capture-libs: CAPTURE_FLAG_EVEN_IF_OLDER shouldn't apply for dependencies

Ludovico de Nittis requested to merge denittis/libcapsule:denittis/fix_capture_flag_check into master

The flag CAPTURE_FLAG_EVEN_IF_OLDER is not supposed to be considered pertinent if we are checking a library dependency.

For this reason when we evaluate if a library dependency is a glibc sub-lib, we should skip checking if CAPTURE_FLAG_EVEN_IF_OLDER is set.

This fixes an issue when capturing libraries with the pattern gl:, while using an host system with glibc <= 2.33 and a container with glibc >= 2.34. In this situation we were wrongly choosing libpthread.so.0 from the provider and libc.so.6 from the container.

/cc @smcv

Edited by Ludovico de Nittis

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