Make sure that -xc++ is always part of the compilation DB. #4974

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5 warnings and 2 notices

😱 syntax:opentitan Expected failures 90, got 94 (will be an error once 4 more)

😱 lint:opentitan Expected failures 90, got 94 (will be an error once 4 more)

😱 preprocessor:basejump_stl Expected failures 642, got 643 (will be an error once 32 more)

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Failed to restore: Cache service responded with 422

🎉 Yay, reduced non-zero exit count 1135 -> 1122

🎉 Yay, reduced non-zero exit count 3067 -> 3029