veyron.io/veyron/veyron/profiles: Add build tag for platform_nacl.go file.
Change-Id: I0963e93f445052471868bc7dedffd51028c8556a
Explanation: Go android build uses 1.2.2 go compiler (because it requires custom patches which haven't yet been released for 1.3), which doesn't understand the _nacl extension, and fails the build.
diff --git a/profiles/platform_nacl.go b/profiles/platform_nacl.go
index da9ed65..0b73e9c 100644
--- a/profiles/platform_nacl.go
+++ b/profiles/platform_nacl.go
@@ -1,3 +1,5 @@
+// +build nacl
+
package profiles
import (
