doctest: if SYSTEM_DOCTEST add a find_package(doctest REQUIRED)
#270
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Hi, I've been working on packaging fast-float for Spack, including tests. Since Spack aims to avoid vendored dependencies, it installs doctest separately in its own prefix and not in the system location. By adding a
find_package(doctest)statement, as recommended in the doctest documentation, fast-float can successfully locate the package, allowing us to build and run the tests properly.I made minimal changes to easily patch older versions.