binutils: import upstream patches for thin archive support
requested to merge aperezdc/freedesktop-sdk:aperezdc/binutils-thin-archive-fix-21.08 into release/21.08
Imports the two patches referenced from the upstream binutils bug which fix handling of thin archives.
Fixes #1388 (closed)
This is the same as !7229 (merged) but targeting the release/21.08 branch