This reverts commit c68e8b05f0.
RANDSTRUCT currently fails to work with out-of-tree modules, as
evinced by
c68e8b05f0 (commitcomment-31850284)
and https://github.com/NixOS/nixpkgs/issues/53522.
Specifically, loading out-of-tree modules results in modsym version
mismatches, as in
spl: version magic '4.20.0 SMP mod_unload modversions RANDSTRUCT_PLUGIN
from the issue above.
A working hypothesis is that the randstruct seed is not carried over when
building out-of-tree modules but more investigation is needed here.
Closes https://github.com/NixOS/nixpkgs/issues/53522
865f7a14b4