A no Arduino version of the latest SdFat library

This is based off the ZuluSCSI custom SdFat library used with GD32
MCUs. It uses the latest changes to the SDFat library along with
GPT compatibility.

It uses the define flag SDFAT_NOARDUINO to disable use of Arduino
libraries.

src/SdFatConfig.h

@@ -87,13 +87,20 @@
 #define DESTRUCTOR_CLOSES_FILE 0
 #endif  // DESTRUCTOR_CLOSES_FILE
 //------------------------------------------------------------------------------
-
+#ifdef SDFAT_NOARDUINO
+#define ENABLE_ARDUINO_FEATURES 0
+#define ENABLE_ARDUINO_SERIAL 0
+#define ENABLE_ARDUINO_STRING 0
+#define SS 0
+extern "C" unsigned long millis();
+#else
 /** For Debug - must be one */
 #define ENABLE_ARDUINO_FEATURES 1
 /** For Debug - must be one */
 #define ENABLE_ARDUINO_SERIAL 1
 /** For Debug - must be one */
 #define ENABLE_ARDUINO_STRING 1
+#endif  // SDFAT_NOARDUINO
 //------------------------------------------------------------------------------
 #if ENABLE_ARDUINO_FEATURES
 #include "Arduino.h"