All our public headers strive to C90 compatibility with a few extensions, and thus avoided stdbool.h and bool. The sd_json_format_enabled() helper seems like a poor place to start requiring stdbool.h now. Also drop __extension__ since we are not using it anywhere else in very similar inline functions. (And we probably should drop any _sd_const declarations on inline functions. Given that the compiler has the function implementation around always, because it's in the header there's really no reason to specify this manually, the compiler can trivially figure this out on its own. But that's for another time.)
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