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This check was added in98fe4bd8f1, to check whether dm_task_deferred_remove could be removed, and to conditionally set the corresponding build-tags. Now that the devicemapper graphdriver has been removed indc11d2a2d8, we no longer need this. This patch: - removes uses of the (no longer used) `libdm`, `dlsym_deferred_remove`, and `libdm_no_deferred_remove` build-tags. - removes the `add_buildtag` utility, which is now unused. Signed-off-by: Sebastiaan van Stijn <github@gone.nl>