[test] check validity of failing testcase, it will be solved by no-re…

…scaling.

So accept for now that result is invalid (which is a false positive)

test/algorithms/buffer/buffer_multi_linestring.cpp

@@ -157,7 +157,11 @@ void test_all()
     test_one<multi_linestring_type, polygon>("mysql_23023665_1",
             mysql_23023665_1, join_round32, end_round32, 1, 1, 186.5504, 1.0);
     test_one<multi_linestring_type, polygon>("touching1_1",
-            touching1, join_round32, end_round32, 2, 0, 78.70773, 1.0);
+            touching1, join_round32, end_round32, 2, 0, 78.70773, 1.0
+#if ! defined(BOOST_GEOMETRY_NO_ROBUSTNESS)
+            , ut_settings::ignore_validity() // false positive, due to rescaling. As we remove it, it is gone
+#endif
+                                             );
     test_one<multi_linestring_type, polygon>("touching2_1",
             touching2, join_round32, end_round32, 1, 1, 107.8991, 1.0);
     test_one<multi_linestring_type, polygon>("mysql_23023665_1_09",