Remove the torint.h include from aes.h

This hasn't been needed for a while, there's nothing in aes.h now that
would need uint* stuff.

src/common/aes.h

@@ -13,8 +13,6 @@
  * \brief Headers for aes.c
  */
 
-#include "torint.h"
-
 struct aes_cnt_cipher;
 typedef struct aes_cnt_cipher aes_cnt_cipher_t;