oeqa/selftest/reproducibile: Explicitly list virtual targets

oeqa/selftest/reproducibile: Explicitly list virtual targets

We're seeing reproducibility failures where some packages don't appear
in the "from sstate" builds. The common factor is these are all recipes
with PROVIDES = "virtual/XXX".

In a full build from scratch, these are build but in a build from sstate,
there are situations where they aren't. For now, to try and keep builds
working, work around the problem until we can better look into the problem.
It is likely recent taskhash imrovements have caused this to occur more
regularly.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>