inttypes: add brief tests for strtoimax and strtoumax

All the tests are done in strtol/strtoll and strtoul/strtoull, the only
important thing is to check that the correct size type is used.

src/inttypes/functions.c

@@ -33,6 +33,12 @@ static void _ft_inttypes_functions(ft_test *t)
 	ft_assert(t, imd.quot == -9ll && imd.rem == 1ll);
 	imd = imaxdiv(-73ll, -8ll);
 	ft_assert(t, imd.quot == 9ll && imd.rem == -1ll);
+
+	ft_log(t, "\nstrtoimax and strtoumax:\n");
+	ft_assert_eval(t, strtoimax("-281474976710656", NULL, 0),
+		-281474976710656ll, "%" PRIdMAX);
+	ft_assert_eval(t, strtoumax("281474976710656", NULL, 0),
+		281474976710656ll, "%" PRIuMAX);
 }
 
 ft_test ft_inttypes_functions = {