x/talks: fix build

LGTM=minux, r
R=r, minux
CC=golang-codereviews
https://golang.org/cl/184070043
diff --git a/2014/gothamgo-android/red.go b/2014/gothamgo-android/red.go
index 9e4bc0f..110f14a 100644
--- a/2014/gothamgo-android/red.go
+++ b/2014/gothamgo-android/red.go
@@ -1,3 +1,5 @@
+// +build OMIT
+
 package main
 
 import (
diff --git a/2014/gothamgo-android/touch.go b/2014/gothamgo-android/touch.go
index 7a84908..0737130 100644
--- a/2014/gothamgo-android/touch.go
+++ b/2014/gothamgo-android/touch.go
@@ -1,3 +1,5 @@
+// +build OMIT
+
 package main
 
 import (