selftests: vDSO: don't include generated headers for chacha test

It's not correct to use $(top_srcdir) for generated header files, for
builds that are done out of tree via O=, and $(objtree) isn't v

selftests: vDSO: don't include generated headers for chacha test

It's not correct to use $(top_srcdir) for generated header files, for
builds that are done out of tree via O=, and $(objtree) isn't valid in
the selftests context. Instead, just obviate the need for these
generated header files by defining empty stubs in tools/include, which
is the same thing that's done for rwlock.h.

Reviewed-by: Adhemerval Zanella <[email protected]>
Signed-off-by: Jason A. Donenfeld <[email protected]>

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