C++ language not enabled on Windows builds, but sometimes it is

The language C++ doesn’t seem to be enabled on all build machines:
https://travis-ci.org/rubenvb/ci-playground/jobs/587816034
vs
https://travis-ci.org/skui-org/skui/jobs/587819192

language: c++ should be language: cpp.

Well, that was a stupid mistake.

The other environments don’t seem to care though, probably why I didn’t notice it.

Thanks

The new Config Validation might help catching this sort of problem.

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