configure sdfat for spiflash and fat12 usage

- SDFAT_FILE_TYPE = 1
- USE_BLOCK_DEVICE_INTERFACE = 1
- FAT12_SUPPORT = 1
- comment out FS.h warning
- add File32 name() function for backward compilable

src/FatLib/FatFile.h

@@ -1082,5 +1082,14 @@ class File32 : public StreamFile<FatFile, uint32_t> {
     tmpFile.openNext(this, oflag);
     return tmpFile;
   }
+
+  /** No longer implemented due to Long File Names.
+   *
+   * Use getName(char* name, size_t size).
+   * \return a pointer to replacement suggestion.
+   */
+  __attribute__((warning("use getName(name, size) instead"))) const char* name() const {
+    return "use getName()";
+  }
 };
 #endif  // FatFile_h

src/SdFat.h

@@ -449,7 +449,7 @@ typedef FsBaseFile SdBaseFile;
 #if defined __has_include
 #if __has_include(<FS.h>)
 #define HAS_INCLUDE_FS_H
-#warning File not defined because __has_include(FS.h)
+// #warning File not defined because __has_include(FS.h)
 #endif  // __has_include(<FS.h>)
 #endif  // defined __has_include
 #ifndef HAS_INCLUDE_FS_H

src/SdFatConfig.h

@@ -32,6 +32,20 @@
 #ifdef __AVR__
 #include <avr/io.h>
 #endif  // __AVR__
+
+//------------- Adafruit configuration -------------//
+#ifndef SDFAT_FILE_TYPE
+#define SDFAT_FILE_TYPE 1
+#endif
+
+#ifndef USE_BLOCK_DEVICE_INTERFACE
+#define USE_BLOCK_DEVICE_INTERFACE 1
+#endif
+
+#ifndef FAT12_SUPPORT
+#define FAT12_SUPPORT 1
+#endif
+
 //
 // To try UTF-8 encoded filenames.
 // #define USE_UTF8_LONG_NAMES 1