message: Work around signed warnings in check headers.
diff: #ifndef VERIBLE_COMMON_UTIL_LOGGING_H_
  #define VERIBLE_COMMON_UTIL_LOGGING_H_
  -#include "absl/log/log.h"
  +#ifdef __GNUC__
  +#pragma GCC diagnostic push
  +#pragma GCC diagnostic ignored "-Wsign-compare"
  +#endif
  #include "absl/log/check.h"
  +#ifdef __GNUC__
  +#pragma GCC diagnostic pop
  +#endif
  +
  +#include "absl/log/log.h"
  #include "absl/log/die_if_null.h"
  // There is no vlog yet.
  