Include everything in our pkg-config autopkgtest

GCC defaults to C++17 currently, but our library users could be on other
(newer/older) standard still e.g. by explicit request, so to avoid
accidentally breaking them the pkg-config-test is adapted to include
all of our public headers as a smoke test for if you can build an
application against our library in a certain C++ standard.

The test script is also adapted to be runnable outside of autopkgtest
like in our CI or manually.

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