Make all the tests ANSI C compatible.

tests/basic_stream/encode_stream.c

@@ -4,6 +4,7 @@
 #include <stdio.h>
 #include <pb_encode.h>
 #include "person.pb.h"
+#include "test_helpers.h"
 
 /* This binds the pb_ostream_t into the stdout stream */
 bool streamcallback(pb_ostream_t *stream, const uint8_t *buf, size_t count)
@@ -22,7 +23,9 @@ int main()
         }};
     
     /* Prepare the stream, output goes directly to stdout */
-    pb_ostream_t stream = {&streamcallback, stdout, SIZE_MAX, 0};
+    pb_ostream_t stream = {&streamcallback, NULL, SIZE_MAX, 0};
+    stream.state = stdout;
+    SET_BINARY_MODE(stdout);
     
     /* Now encode it and check if we succeeded. */
     if (pb_encode(&stream, Person_fields, &person))