security: In key-chain.cpp, need to use namespace ndn::func_lib to use bind, etc. Refs #1063
diff --git a/src/security/key-chain.cpp b/src/security/key-chain.cpp
index d3e7a6a..75d3aaa 100644
--- a/src/security/key-chain.cpp
+++ b/src/security/key-chain.cpp
@@ -17,6 +17,7 @@
using namespace std;
using namespace ndn::ptr_lib;
+using namespace ndn::func_lib;
#if NDN_CPP_HAVE_STD_FUNCTION
// In the std library, the placeholders are in a different namespace than boost.
using namespace func_lib::placeholders;