go.talks: fix build

LGTM=minux
R=dave, minux
CC=golang-codereviews
https://golang.org/cl/122980043
diff --git a/2014/testing/httprecorder.go b/2014/testing/httprecorder.go
index 95ea793..040c029 100644
--- a/2014/testing/httprecorder.go
+++ b/2014/testing/httprecorder.go
@@ -1,3 +1,5 @@
+// +build OMIT
+
 package main
 
 import (
diff --git a/2014/testing/httpserver.go b/2014/testing/httpserver.go
index 5917705..0e078c4 100644
--- a/2014/testing/httpserver.go
+++ b/2014/testing/httpserver.go
@@ -1,3 +1,5 @@
+// +build OMIT
+
 package main
 
 import (