Update to the latest automake / autoconf configuration files
diff --git a/aclocal.m4 b/aclocal.m4
index e33ff56..24f9616 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -21,7 +21,7 @@
To do so, use the procedure documented by the package, typically 'autoreconf'.])])
# longlong.m4 serial 17
-dnl Copyright (C) 1999-2007, 2009-2014 Free Software Foundation, Inc.
+dnl Copyright (C) 1999-2007, 2009-2015 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.