fix fdatasync bug

components/external/SQLite-3.8.1/SQLiteLib/sqlite3.c

@@ -24400,13 +24400,9 @@ SQLITE_API int sqlite3_fullsync_count = 0;
 ** then simply compile with -Dfdatasync=fdatasync
 */
 #if !defined(fdatasync)
-#include "dfs.h"
-#include "dfs_file.h"
 int fdatasync(fd)
 {
-    struct dfs_fd *dfs_fd;
-    dfs_fd = fd_get(fd);
-    return dfs_file_flush(dfs_fd);
+    fsync(fd);
 }
 #endif