C23 makes bool a reserved keyword and provides the type by default making some thorns (and the flesh) fail to compiled.

These three pull requests add the required #include <stdbool.h> to the respective files. Since this exists in c99, which Cactus requires, this is fine.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2949/use-c99-bool-instead-of-typedefing-our-own