Build[Solaris]: replace nullptr_t() with null ptr (#884)

Signed-off-by: Evgeny Malygin <emalygin@bloomberg.net>

Author: 678098

src/groups/mqb/mqbblp/mqbblp_clusterqueuehelper.cpp

@@ -2179,7 +2179,7 @@ bsl::shared_ptr<mqbi::Queue> ClusterQueueHelper::createQueueFactory(
         bdlf::BindUtil::bindS(d_allocator_p,
                               &mqbi::Storage::setQueue,
                               queueSp->storage(),
-                              bsl::nullptr_t()));
+                              static_cast<mqbi::Queue*>(0)));
 
     if (rc != 0) {
         // Queue.configure() failed.

src/groups/mqb/mqbblp/mqbblp_domain.cpp

@@ -348,9 +348,9 @@ int Domain::configure(bsl::ostream&           errorDescription,
             bsl::function<int()> reconfigureQueueFn = bdlf::BindUtil::bind(
                 &mqbi::Queue::configure,
                 it->second.get(),
-                bsl::nullptr_t(),  // errorDescription_p
-                true,              // isReconfigure
-                false);            // wait
+                static_cast<bsl::ostream*>(0),  // errorDescription_p
+                true,                           // isReconfigure
+                false);                         // wait
             d_dispatcher_p->execute(reconfigureQueueFn, cluster());
         }
     }