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An 'F' entry whose interpreter keeps the binfmt_misc superblock alive
pins the instance that owns it forever. Cover both ways to build that:
- an interpreter on the instance's own files, control file and entry
file alike
- and an instance used as an overlayfs lower layer.
Check that an ordinary 'F' registration still succeeds so the fix stays
honest about not changing what 'F' promises.
Link: https://patch.msgid.link/20260728-work-binfmt_misc-selfpin-v1-2-74df5daeca5b@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
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