Address compiler warnings in Scribo.
* scribo/debug/logger.hh (scribo::debug::internal::logger_::log) [!SCRIBO_NDEBUG]: Avoid warnings about unused arguments in non-debug mode. * scribo/layout/xy_cut.hh (scribo::layout::internal::compute_hist_info_h) (scribo::layout::internal::compute_hist_info_v): Use `def::coord' instead of `int' as coordinate type, to avoid comparisons between signed and unsigned values. * src/misc/rectangularity.cc (main) * tests/binarization/global_threshold.cc (main) * tests/layout/xy_cut.cc (main): Avoid warnings about unused arguments. * tests/core/object_groups.cc (main): Likewise. Use `unsigned' instead of `int' as count/id type, to avoid comparisons between signed and unsigned values.