tkn20: Don't build outdated source file

bwesterb · bwesterb · commit 459b64f53bc6 · 2022-12-19T11:51:04.000+01:00
Temporary workaround for #385.
diff --git a/abe/cpabe/tkn20/testdata/serialize.go b/abe/cpabe/tkn20/testdata/serialize.go
@@ -1,3 +1,5 @@
+//go:build exclude
+
 package main
 
 import (
