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The LIST_HEAD() macro conflicts with the <sys/queue.h> declaration
of the same name.  Delete the unused LIST_HEAD() macro from the
libext2fs and libblkid headers to avoid compiler warnings.  It can
be replaced by INIT_LIST_HEAD() or LIST_HEAD_INIT() if needed.
Signed-off-by: Andreas Dilger <adilger@dilger.ca>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>