signal_base: Remove unnecessary trackable.h include.

murraycu · murraycu · commit f55bdf9b8980 · 2016-04-28T12:59:44.000+02:00
diff --git a/sigc++/signal_base.h b/sigc++/signal_base.h
@@ -24,7 +24,6 @@
 #include <memory> //For std::shared_ptr<>
 #include <sigc++config.h>
 #include <sigc++/type_traits.h>
-#include <sigc++/trackable.h>
 #include <sigc++/functors/slot.h>
 #include <sigc++/functors/mem_fun.h>
 
