cleanup programs

Clean up the contents of programs, add more guards to includes, move all
defines to the top of the top of files, remove some unused includes
diff --git a/programs/aes/crypt_and_hash.c b/programs/aes/crypt_and_hash.c
index 7ad07b4..67b5f2b 100644
--- a/programs/aes/crypt_and_hash.c
+++ b/programs/aes/crypt_and_hash.c
@@ -30,8 +30,19 @@
 #if defined(POLARSSL_PLATFORM_C)
 #include "polarssl/platform.h"
 #else
-#define polarssl_printf     printf
+#include <stdio.h>
 #define polarssl_fprintf    fprintf
+#define polarssl_printf     printf
+#endif
+
+#if defined(POLARSSL_CIPHER_C) && defined(POLARSSL_MD_C) &&\
+ defined(POLARSSL_FS_IO)
+#include "polarssl/cipher.h"
+#include "polarssl/md.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
 #endif
 
 #if defined(_WIN32)
@@ -44,14 +55,6 @@
 #include <unistd.h>
 #endif
 
-#include <string.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <time.h>
-
-#include "polarssl/cipher.h"
-#include "polarssl/md.h"
-
 #define MODE_ENCRYPT    0
 #define MODE_DECRYPT    1
 
@@ -61,13 +64,14 @@
     "\n  example: crypt_and_hash 0 file file.aes AES-128-CBC SHA1 hex:E76B2413958B00E193\n" \
     "\n"
 
-#if !defined(POLARSSL_CIPHER_C) || !defined(POLARSSL_MD_C)
+#if !defined(POLARSSL_CIPHER_C) || !defined(POLARSSL_MD_C) ||\
+    !defined(POLARSSL_FS_IO)
 int main( int argc, char *argv[] )
 {
     ((void) argc);
     ((void) argv);
 
-    polarssl_printf("POLARSSL_CIPHER_C and/or POLARSSL_MD_C not defined.\n");
+    polarssl_printf("POLARSSL_CIPHER_C and/or POLARSSL_MD_C and/or POLARSSL_FS_IO not defined.\n");
     return( 0 );
 }
 #else
@@ -542,4 +546,4 @@
 
     return( ret );
 }
-#endif /* POLARSSL_CIPHER_C && POLARSSL_MD_C */
+#endif /* POLARSSL_CIPHER_C && POLARSSL_MD_C && POLARSSL_FS_IO */