nsjail: fix bison link error

The nsjail build has been broken since the 3.7.5 bison bump:

  /nix/store/(...)/bin/ld: kafel/libkafel.a(libkafel.o):
    in function `kafel_yyerror':
  arm_syscalls.c:(.text+0x6833): undefined reference to `YYUSE'

The issue is coming from kafel and has been fixed upstream. More infos
at: https://github.com/google/kafel/pull/28.

Kafel being distributed through a git submodule in the nsjail repo, we
can't directly fetchpatch the fix from Github. We had to manually
modify the said patch to add a /kafel prefix.

We'll need to remove this patch for the next nsjail version bump.

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