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

Environments Windows
1

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

2

language: c++ should be language: cpp.

3

Well, that was a stupid mistake.

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

Thanks

4

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