WIP: Fix build with BuildStream master.
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project.conf: Copy over variables needed for strip-commands
They have been removed from BuildStream master.
https://gitlab.com/BuildStream/buildstream/merge_requests/987
https://gitlab.com/freedesktop-sdk/freedesktop-sdk/merge_requests/772
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Use git_tag source plugin for sdk/vala.bst and core-deps/gnome-online-miners.bst