Merge #11440: Fix validationinterface build on super old boost/clang

96c2ce9 Fix validationinterface build on super old boost/clang (Matt Corallo)

Pull request description:

  This should fix all the non-dependancy issues for termux builds.
  See Github issue #11388.

Tree-SHA512: ff0918fa76a6d4639a6c5b5e045ef053ce1d93eb0b1fe94c5fdfcc4d5e54e1118eeb09676ffd8f6d1acd630a63656944c6274ee3dbd7c09b7129c30647dbf4f9

Author: laanwj

src/validationinterface.cpp

@@ -4,7 +4,9 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include "validationinterface.h"
+
 #include "init.h"
+#include "primitives/block.h"
 #include "scheduler.h"
 #include "sync.h"
 #include "util.h"