Update struct layout for aarch64 linux to match value on device

src/main/java/jnr/posix/LinuxFileStatAARCH64.java

@@ -17,16 +17,19 @@ public Layout(jnr.ffi.Runtime runtime) {
         public final uid_t st_uid = new uid_t();
         public final gid_t st_gid = new gid_t();
         public final dev_t st_rdev = new dev_t();
+        public final dev_t __pad1 = new dev_t();
         public final off_t st_size = new off_t();
         public final blksize_t st_blksize = new blksize_t();
+        public final Signed32 __pad2 = new Signed32();
         public final blkcnt_t st_blocks = new blkcnt_t();
         public final time_t st_atime = new time_t();             // Time of last access
         public final SignedLong st_atimensec = new SignedLong(); // Time of last access (nanoseconds)
         public final time_t st_mtime = new time_t();             // Last data modification time
         public final SignedLong st_mtimensec = new SignedLong(); // Last data modification time (nanoseconds)
         public final time_t st_ctime = new time_t();             // Time of last status change
         public final SignedLong st_ctimensec = new SignedLong(); // Time of last status change (nanoseconds)
-        public final Signed64 __unused4 = new Signed64();
+        public final Signed32 __unused4 = new Signed32();
+        public final Signed32 __unused5 = new Signed32();
     }
 
     private static final Layout layout = new Layout(jnr.ffi.Runtime.getSystemRuntime());

src/test/java/jnr/posix/FileStatTest.java

@@ -61,6 +61,7 @@ public void filestat() throws Throwable {
             FileStat stat = posix.stat(f.getAbsolutePath());
             assertNotNull("posix.stat failed", stat);
             assertEquals(size, stat.st_size());
+            assertEquals(1, stat.nlink());
             //assertNotEquals(stat.mtime(), stat.ctime());
 
             stat = posix.allocateStat();