Make sure polarssl/config.h is included at the start

(cherry picked from commit 9691bbe9b3)

tests/scripts/generate_code.pl

@@ -49,6 +49,7 @@ $/ = $line_separator;
 open(TEST_FILE, ">$test_file") or die "Opening destination file '$test_file': $!";
 print TEST_FILE << "END";
 #include "fct.h"
+#include <polarssl/config.h>
 
 $suite_header
 

tests/suites/helpers.function

@@ -1,5 +1,3 @@
-#include <polarssl/config.h>
-
 #ifdef _MSC_VER
 #include <basetsd.h>
 typedef UINT32 uint32_t;