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/util/strerror.c b/programs/util/strerror.c
index c5598fc..f4da587 100644
--- a/programs/util/strerror.c
+++ b/programs/util/strerror.c
@@ -29,14 +29,17 @@
#if defined(POLARSSL_PLATFORM_C)
#include "polarssl/platform.h"
#else
+#include <stdio.h>
#define polarssl_printf printf
#endif
+#if defined(POLARSSL_ERROR_C) || defined(POLARSSL_ERROR_STRERROR_DUMMY)
+#include "polarssl/error.h"
+
+#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <stdio.h>
-
-#include "polarssl/error.h"
+#endif
#define USAGE \
"\n usage: strerror <errorcode>\n" \