Make reasoning about dependencies easier by not including unused dependencies

src/validationinterface.cpp

@@ -8,8 +8,6 @@
 #include <primitives/block.h>
 #include <scheduler.h>
 #include <txmempool.h>
-#include <util/system.h>
-#include <validation.h>
 
 #include <list>
 #include <atomic>