testing/doctest: new aport

Closed Nick Black requested to merge (removed):dankamongmen/doctest into master

URL: https://github.com/onqtam/doctest

doctest is a fast (to compile) C++ unit testing framework implemented purely as a header file -- there are no libraries which must be linked.

With the addition of this aport, I'll be able to enable unit testing in the testing/notcurses aport, which seems a fine thing (!9828 (closed)).

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