change test function includes to use one convention
diff --git a/tests/suites/test_suite_mpi.function b/tests/suites/test_suite_mpi.function
index 2835acb..795d2a0 100644
--- a/tests/suites/test_suite_mpi.function
+++ b/tests/suites/test_suite_mpi.function
@@ -1,5 +1,5 @@
 /* BEGIN_HEADER */
-#include <polarssl/bignum.h>
+#include "polarssl/bignum.h"
 /* END_HEADER */
 
 /* BEGIN_DEPENDENCIES