modify library/memory_buffer_alloc.c, benchmark.c and the tests main code to use polarssl_exit

tests/suites/main_test.function

@@ -1,3 +1,16 @@
+#include <stdio.h>
+#include <string.h>
+
+#if defined(POLARSSL_PLATFORM_C)
+#include "polarssl/platform.h"
+#else
+#define polarssl_exit       exit
+#define polarssl_free       free
+#define polarssl_malloc     malloc
+#define polarssl_fprintf    fprintf
+#define polarssl_printf     printf
+#endif
+
 #if defined(POLARSSL_MEMORY_BUFFER_ALLOC_C)
 #include "polarssl/memory_buffer_alloc.h"
 #endif
@@ -268,7 +281,7 @@ int main()
         {
             polarssl_fprintf( stderr, "FAILED: FATAL PARSE ERROR\n" );
             fclose(file);
-            exit( 2 );
+            polarssl_exit( 2 );
         }
         else
             total_errors++;