examples/console: error out if built with USB CDC enabled

Author: igrr

examples/system/console/main/console_example_main.c

@@ -21,6 +21,10 @@
 #include "nvs.h"
 #include "nvs_flash.h"
 
+#ifdef CONFIG_ESP_CONSOLE_USB_CDC
+#error This example is incompatible with USB CDC console. Please try "console_usb" example instead.
+#endif // CONFIG_ESP_CONSOLE_USB_CDC
+
 static const char* TAG = "example";
 #define PROMPT_STR CONFIG_IDF_TARGET