Number "unknown" axes in OSX rather than call them all "unk".

Source/Core/InputCommon/Src/ControllerInterface/OSX/OSXJoystick.mm

@@ -121,7 +121,9 @@
 	// Need to parse the element a bit first
 	std::string description("unk");
 
-	switch (IOHIDElementGetUsage(m_element)) {
+	int const usage = IOHIDElementGetUsage(m_element);
+	switch (usage)
+	{
 	case kHIDUsage_GD_X:
 		description = "X";
 		break;
@@ -146,6 +148,13 @@
 	case kHIDUsage_Csmr_ACPan:
 		description = "Pan";
 		break;
+	default:
+	{
+		std::ostringstream s;
+		s << usage;
+		description = s.str();
+		break;
+	}
 	}
 
 	m_name = std::string("Axis ") + description;