[libc++] Mark two tests as unsupported in C++03

This was dropped when I split the tests into individual source files
to make sure they would actually run (in 2908eb2).

Author: ldionne

libcxx/test/libcxx/containers/unord/unord.multimap/db_local_iterators_10.pass.cpp

@@ -11,6 +11,7 @@
 // Dereference non-dereferenceable iterator.
 
 // UNSUPPORTED: libcxx-no-debug-mode
+// UNSUPPORTED: c++03
 
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DEBUG=1
 #define _LIBCPP_ASSERT(x, m) ((x) ? (void)0 : std::exit(0))

libcxx/test/libcxx/containers/unord/unord.multimap/db_local_iterators_9.pass.cpp

@@ -11,6 +11,7 @@
 // Increment local_iterator past end.
 
 // UNSUPPORTED: libcxx-no-debug-mode
+// UNSUPPORTED: c++03
 
 // ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DEBUG=1
 #define _LIBCPP_ASSERT(x, m) ((x) ? (void)0 : std::exit(0))