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/security/public-key.cpp b/src/security/public-key.cpp
index 27992ca..09222a4 100644
--- a/src/security/public-key.cpp
+++ b/src/security/public-key.cpp
@@ -7,7 +7,8 @@
  */
 
 #include "common.hpp"
-#include "security/public-key.hpp"
+
+#include "public-key.hpp"
 
 #include <cryptopp/rsa.h>
 #include <cryptopp/base64.h>