Disable ticket_6742_... on macOS; libc++ wants iterators to be assignable and transform_iterator<phoenix::actor<...>> is not

Author: pdimov

test/Jamfile.v2

@@ -62,7 +62,11 @@ run adaptor_test/reversed.cpp ;
 run adaptor_test/sliced.cpp ;
 run adaptor_test/strided.cpp ;
 run adaptor_test/strided2.cpp ;
-run adaptor_test/ticket_6742_transformed_c4789_warning.cpp : <library>/boost/phoenix//boost_phoenix ;
+
+run adaptor_test/ticket_6742_transformed_c4789_warning.cpp : <library>/boost/phoenix//boost_phoenix
+  # copy assignment operator of 'transform_iterator<boost::phoenix::actor<...' is deleted
+  <target-os>darwin:<build>no ;
+
 run adaptor_test/ticket_8676_sliced_transformed.cpp ;
 run adaptor_test/ticket_9519_strided_reversed.cpp ;
 run adaptor_test/tokenized.cpp ;