Revert "lxd/storage/quota: Build on older systems"
Revert "lxd/storage/quota: Build on older systems"

This reverts commit 0e32aa23f9cd7349cb6c6fd04ce87970bff6b553.

Signed-off-by: Stéphane Graber <089afc6d81f66f1168a9849e15660feae286e024@ubuntu.com>

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