libstrat: enable -Wextra, -Werror

This caught an embarrassingly large number of bugs.

libraries/libstratosphere/source/lm/lm_remote_log_service.cpp

@@ -35,11 +35,16 @@ namespace ams::lm {
     }
 
     Result RemoteLogService::OpenLogger(sf::Out<sf::SharedPointer<::ams::lm::ILogger>> out, const sf::ClientProcessId &client_process_id) {
+        AMS_UNUSED(client_process_id);
+
         /* Send libnx command. */
         ::Service logger_srv;
         {
+            u64 pid_placeholder;
+
             #define NX_SERVICE_ASSUME_NON_DOMAIN
-            R_TRY(serviceDispatch(&m_srv, 0,
+            R_TRY(serviceDispatchIn(&m_srv, 0, pid_placeholder,
+                .in_send_pid = true,
                 .out_num_objects = 1,
                 .out_objects = &logger_srv,
             ));

libraries/libstratosphere/source/lm/srv/lm_flush_thread.cpp

@@ -44,6 +44,7 @@ namespace ams::lm::srv {
         }
 
         void DeallocateForFs(void *ptr, size_t size) {
+            AMS_UNUSED(size);
             return lmem::FreeToExpHeap(g_fs_heap_handle, ptr);
         }
 

libraries/libstratosphere/source/lm/srv/lm_logger_impl.cpp

@@ -91,6 +91,10 @@ namespace ams::lm::srv {
                     diag::impl::PutImpl(meta, txt, size);
                 }, const_cast<diag::LogMetaData *>(std::addressof(log_meta)));
             }
+            #else
+            {
+                AMS_UNUSED(message);
+            }
             #endif
         }