BT define the hal methods even if BT is disabled (but return false)

cores/esp32/esp32-hal-bt.c

@@ -64,5 +64,20 @@ bool btStop(){
     return false;
 }
 
+#else
+bool btStarted()
+{
+    return false;
+}
+
+bool btStart()
+{
+    return false;
+}
+
+bool btStop()
+{
+    return false;
+}
 #endif