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feat(libcdb): use local debuginfod client cache before hitting servers (#2623) (#2726)

* feat(libcdb): use local debuginfod client cache before hitting servers (#2623)

If gdb / eu-debuginfod-find / abrt has already downloaded the matching
debuginfo for our libc's build-id (cached at $DEBUGINFOD_CACHE_PATH or
$XDG_CACHE_HOME/debuginfod_client/ or ~/.cache/debuginfod_client/),
unstrip_libc() now reuses it directly instead of doing another network
round-trip via debuginfod servers. Validated by ELF magic so non-ELF
junk in the cache is ignored.

Closes #2623

* Update CHANGELOG.md for #2726

* Check our own cache before looking at debuginfod-client

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Co-authored-by: Chris (ChrisJr404) <11917633+ChrisJr404@users.noreply.github.com>
Co-authored-by: Peace-Maker <peacemakerctf@gmail.com>

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