Fixed regression that prevented builds with compatibiliy level set > 1.

Added [SIGNALS:xxx] element to the $I output.

driver_opts.h

@@ -379,9 +379,32 @@
 #endif
 #endif
 
+// Optional control signals
+
 #ifndef SAFETY_DOOR_ENABLE
 #define SAFETY_DOOR_ENABLE  0
 #endif
+#ifndef PROBE_DISCONNECT_ENABLE
+#define PROBE_DISCONNECT_ENABLE 0
+#endif
+#ifndef STOP_DISABLE_ENABLE
+#define STOP_DISABLE_ENABLE 0
+#endif
+#ifndef BLOCK_DELETE_ENABLE
+#define BLOCK_DELETE_ENABLE 0
+#endif
+#ifndef SINGLE_BLOCK_ENABLE
+#define SINGLE_BLOCK_ENABLE 0
+#endif
+#ifndef MOTOR_FAULT_ENABLE
+#define MOTOR_FAULT_ENABLE 0
+#endif
+#ifndef MOTOR_WARNING_ENABLE
+#define MOTOR_WARNING_ENABLE 0
+#endif
+#ifndef LIMITS_OVERRIDE_ENABLE
+#define LIMITS_OVERRIDE_ENABLE 0
+#endif
 
 #if SAFETY_DOOR_ENABLE && defined(NO_SAFETY_DOOR_SUPPORT)
 #error "Driver does not support safety door functionality!"
@@ -397,6 +420,8 @@
   #warning "Enabling ESTOP may not work with all senders!"
 #endif
 
+//
+
 #ifndef WIFI_ENABLE
 #define WIFI_ENABLE         0
 #endif