build: make precompiled headers more useful

This can reduce the compilation time of a release
build (without tests) by more than 40%

Refs: #5212
Change-Id: I977aff0c0c7becbfee8a8b55605b81d0c014829b
diff --git a/core/network.hpp b/core/network.hpp
index cc6c2bb..f9fbe4f 100644
--- a/core/network.hpp
+++ b/core/network.hpp
@@ -26,7 +26,8 @@
 #ifndef NFD_CORE_NETWORK_HPP
 #define NFD_CORE_NETWORK_HPP
 
-#include "common.hpp"
+#include <boost/asio/ip/address.hpp>
+#include <string_view>
 
 namespace nfd {