[glib-networking] Fix distcheck

[Dan Winship <danw src gnome org>]

commit a36cb7179da535f7afe7af4f4b6e8ac37938fde3
Author: Dan Winship <danw gnome org>
Date:   Mon Oct 12 17:03:36 2015 -0400

    Fix distcheck

 tls/tests/Makefile.am |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/tls/tests/Makefile.am b/tls/tests/Makefile.am
index 21af947..2dd071e 100644
--- a/tls/tests/Makefile.am
+++ b/tls/tests/Makefile.am
@@ -41,6 +41,8 @@ endif
 
 testfiles_data =                               \
        files/ca.pem                            \
+       files/ca-alternative.pem                \
+       files/ca-key.pem                        \
        files/ca-roots.pem                      \
        files/ca-roots-bad.pem                  \
        files/ca-verisign-sha1.pem              \