message: Output "Unknown" if Arduino/ESP-IDF version is unknown
  Closes
diff: // #pragma message "ESP_ARDUINO_VERSION_PATCH = " STRING(ESP_ARDUINO_VERSION_PATCH)
  #define VER_ARDUINO_STR STRING(ESP_ARDUINO_VERSION_MAJOR) "." STRING(ESP_ARDUINO_VERSION_MINOR) "." STRING(ESP_ARDUINO_VERSION_PATCH)
  #else
  - #include <core_version.h>
  + // #include <core_version.h>
  // #pragma message "ESP_ARDUINO_VERSION_GIT = " STRING(ARDUINO_ESP32_GIT_VER)// 0x46d5afb1
  // #pragma message "ESP_ARDUINO_VERSION_DESC = " STRING(ARDUINO_ESP32_GIT_DESC) // 1.0.6
  - #define VER_ARDUINO_STR STRING(ARDUINO_ESP32_GIT_DESC)
  + #define VER_ARDUINO_STR "Unknown"
  // #pragma message "ESP_ARDUINO_VERSION_REL = " STRING(ARDUINO_ESP32_RELEASE) //"1_0_6"
  #endif
  