Merge patch series "filesystems selftests cleanups and fanotify test"

Amir Goldstein <amir73il@gmail.com> says:

This adds a test for fanotify mount ns notifications inside userns [1].

While working on the test I ended up making lots of cleanups to reduce
build dependency on make headers_install.

These patches got rid of the dependency for my kvm setup for the
affected filesystems tests.

Building with TOOLS_INCLUDES dir was recommended by John Hubbard [2].

NOTE #1: these patches are based on a merge of vfs-6.16.mount
(changes wrappers.h) into v6.15-rc5 (changes mount-notify_test.c),
so if this cleanup is acceptable, we should probably setup a selftests
branch for 6.16, so that it can be used to test the fanotify patches.

NOTE #2: some of the defines in wrappers.h are left for overlayfs and
mount_setattr tests, which were not converted to use TOOLS_INCLUDES.
I did not want to mess with those tests.

* patches from https://lore.kernel.org/20250509133240.529330-1-amir73il@gmail.com:
  selftests/fs/mount-notify: add a test variant running inside userns
  selftests/filesystems: create setup_userns() helper
  selftests/filesystems: create get_unique_mnt_id() helper
  selftests/fs/mount-notify: build with tools include dir
  selftests/mount_settattr: remove duplicate syscall definitions
  selftests/pidfd: move syscall definitions into wrappers.h
  selftests/fs/statmount: build with tools include dir
  selftests/filesystems: move wrapper.h out of overlayfs subdir

Link: https://lore.kernel.org/20250509133240.529330-1-amir73il@gmail.com
Signed-off-by: Christian Brauner <brauner@kernel.org>

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