target-sh4: Fix struct target_stat64 for 64-bit host

Signed-off-by: Takashi YOSHII <takasi-y@ops.dti.ne.jp>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6482 c046a42c-6fe2-441c-8c8c-71466251a162

linux-user/syscall_defs.h

@@ -1475,7 +1475,7 @@ struct target_stat {
 /* This matches struct stat64 in glibc2.1, hence the absolutely
  * insane amounts of padding around dev_t's.
  */
-struct target_stat64 {
+struct __attribute__((__packed__)) target_stat64 {
 	unsigned long long	st_dev;
 	unsigned char	__pad0[4];