Fixes stdlib.h dependencies in test suites
Moved stdlib.h in test suites, so platforms that don't support
MBEDTLS_PLATFORM_C would build.
diff --git a/tests/suites/helpers.function b/tests/suites/helpers.function
index edf1d12..d12be75 100644
--- a/tests/suites/helpers.function
+++ b/tests/suites/helpers.function
@@ -2,11 +2,12 @@
/*----------------------------------------------------------------------------*/
/* Headers */
+#include <stdlib.h>
+
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#include <stdio.h>
-#include <stdlib.h>
#define mbedtls_printf printf
#define mbedtls_fprintf fprintf
#define mbedtls_calloc calloc