hello-cpp: init

Proposal: a trivial hello-cpp to complement gnu hello, testing C++ and
cmake infrastructure.

This is intended to assist with testing exotic stdenvs such as the one
used in pkgsLLVM, requiring no additional dependencies to get a quick
test that the compiler and cmake are working as intended as a basic
level.

There does already exist tests.cc-wrapper, but this does not produce any
outputs, and sometimes it is useful to have a quick test that something
builds. It's also useful to be able to inspect the outputs to look at
references and so forth.

Signed-off-by: Peter Waller <p@pwaller.net>

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