build: Experimental support to build using precompiled headers

This type of build needs to be explicitly enabled using --with-pch
configure option.

Change-Id: I02dc304187d54c3cf40f1d51b1b11b21f868e225
diff --git a/src/util/logging.cpp b/src/util/logging.cpp
index 7147768..59c7b2a 100644
--- a/src/util/logging.cpp
+++ b/src/util/logging.cpp
@@ -6,6 +6,8 @@
  * See COPYING for copyright and distribution information.
  */
 
+#include "common.hpp"
+
 #include "logging.hpp"
 
 #ifdef NDN_CPP_HAVE_LOG4CXX