Only include irc.h when needed

src/headers.h

@@ -120,7 +120,6 @@
 #include "script.h"
 #include "db.h"
 #include "net.h"
-#include "irc.h"
 #include "main.h"
 #include "rpc.h"
 #ifdef GUI

src/irc.cpp

@@ -3,6 +3,7 @@
 // file license.txt or http://www.opensource.org/licenses/mit-license.php.
 
 #include "headers.h"
+#include "irc.h"
 
 using namespace std;
 using namespace boost;

src/net.cpp

@@ -3,6 +3,7 @@
 // file license.txt or http://www.opensource.org/licenses/mit-license.php.
 
 #include "headers.h"
+#include "irc.h"
 
 #ifdef USE_UPNP
 #include <miniupnpc/miniwget.h>