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Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>

By the commits in mainline,
59b2bd05f5f4 2019-06-15 kbuild: add 'headers' target to build up uapi headers in usr/include
d5470d14431e 2019-06-15 kbuild: re-implement Makefile.headersinst without recursion
555187a8791d 2019-06-15 kbuild: simplify scripts/headers_install.sh

the scheme changed a little bit.  Since aufs standalone GIT generates
and installs aufs_type.h to userspace, simply follow the new scheme.
Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>

Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>

Signed-off-by: J. R. Okajima <hooanon05g@gmail.com>
(cherry picked from commit 7555811a8741218089016a6abed15a440baca476)