Workaround for MSVC2013's buggy atomic

src/gui/dialogs/loadscreen.cpp

@@ -115,7 +115,12 @@ void tloadscreen::progress(const char* stage)
 		return;
 	}
 	if(stage) {
-		current_load->current_stage_.store(stage, std::memory_order_release);
+		current_load->current_stage_
+#if defined(_MSC_VER) && _MSC_VER < 1900
+			= stage;
+#else
+			.store(stage, std::memory_order_release);
+#endif
 	}
 }
 
@@ -126,7 +131,12 @@ void tloadscreen::timer_callback(twindow& window)
 	if (!worker_ || worker_->timed_join(boost::posix_time::milliseconds(0))) {
 		window.close();
 	}
-	const char* stage = current_stage_.load(std::memory_order_acquire);
+	const char* stage = current_stage_
+#if defined(_MSC_VER) && _MSC_VER < 1900
+		;
+#else
+		.load(std::memory_order_acquire);
+#endif
 	if (stage && (current_visible_stage_ == stages.end() || stage != current_visible_stage_->first))
 	{
 		auto iter = stages.find(stage);

src/gui/dialogs/loadscreen.hpp

@@ -51,7 +51,7 @@ class tloadscreen : public tdialog
 	/**
 	 * Hides the window.
 	 *
-	 * The hiding also destroys the window. It is save to call the function
+	 * The hiding also destroys the window. It is safe to call the function
 	 * when the window is not shown.
 	 */
 	void close();
@@ -79,7 +79,12 @@ class tloadscreen : public tdialog
 	tlabel* animation_label_;
 	static tloadscreen* current_load;
 
+#if defined(_MSC_VER) && _MSC_VER < 1900
+	// std::atomic is buggy in MSVC 2013 - doesn't work for cv types
+	const char* current_stage_;
+#else
 	std::atomic<const char*> current_stage_;
+#endif
 	std::map<std::string,std::string>::const_iterator current_visible_stage_;
 };