Add header file to arguments

[nagua]

I want to integrate compdb in my ci system for clang-tidy. I noticed, that clang-tidy is not able to run on a header file if the file is not listed inside the arguments of the generated compile arguments.

[Sarcasm]

Indeed, there is an issue, clang-tidy does not use the filename arguments, but use the file from the command line.

$ clang-tidy -p . Command.h
Error while processing /home/papin_g/dev/ws/irony/irony-mode/server/src/Command.h.

I would argue that maybe it's clang-tidy (or clang tools) that should be fixed, but still we can be accommodating.

Would you mind fixing the failing tests in the PR, so I can merge it?

[nagua]

Hey, the tests should be fixed now.

[Sarcasm]

Great! Thank you it's merged.