build: Be careful with unicode and byte strings for python3 compatibility.

Signed-off-by: Johannes Krampf <johannes.krampf@googlemail.com>
diff --git a/scripts/transdump.py b/scripts/transdump.py
index 4caaeb7..665f04a 100755
--- a/scripts/transdump.py
+++ b/scripts/transdump.py
@@ -44,7 +44,10 @@
         filehdl = open(filename, 'r')
     mem = parseMem(filehdl)
     for i in mem:
-        sys.stdout.write(struct.pack("<I", i))
+        if (sys.version_info > (3, 0)):
+            sys.stdout.buffer.write(struct.pack("<I", i))
+        else:
+            sys.stdout.write(struct.pack("<I", i))
 
 if __name__ == '__main__':
     main()