Update tri and cube with stage
These changes were cherry-picked from nvidia-dev-20150218 and
KhronosGroup/GDC-stable.
diff --git a/demos/zlib/inffast.h b/demos/zlib/inffast.h
new file mode 100644
index 0000000..1e88d2d
--- /dev/null
+++ b/demos/zlib/inffast.h
@@ -0,0 +1,11 @@
+/* inffast.h -- header to use inffast.c
+ * Copyright (C) 1995-2003 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h
+ */
+
+/* WARNING: this file should *not* be used by applications. It is
+ part of the implementation of the compression library and is
+ subject to change. Applications should only use zlib.h.
+ */
+
+void inflate_fast OF((z_streamp strm, unsigned start));