[libsigc++2/variadic] Updated .gitignore.

[Murray Cumming <murrayc src gnome org>]

commit 8372bd78c6668303129d0cadfbc8cabf6c0a81dc
Author: Murray Cumming <murrayc murrayc com>
Date:   Fri Jan 15 09:51:30 2016 +0100

    Updated .gitignore.

 tests/.gitignore |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/tests/.gitignore b/tests/.gitignore
index ff35316..bee6f9a 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -33,5 +33,6 @@
 /test_tuple_cat
 /test_tuple_cdr
 /test_tuple_end
+/test_tuple_for_each
 /test_tuple_start
 /test_visit_each