Change the test source location to support evolving downstream testing
requirements. This is needed both for downstream certification
activities and changes to test development for internal infrastructure
differences.
The C++ library is quite small (~40K), but it brings in libstdc++ (~2.7M).
The split prevents packages only using the C library (such as Python)
from transitively depending on libstdc++.
Provide names of Fedora contributors
Resolves: rhbz#2157620
