[Rivet-svn] rivet: Fix missing header to make gcc-7.1 builds work.

[Rivet Mercurial]

details:   https://rivet.hepforge.org/hg/rivet/rev/81b590b2d183
branches:  release-2-5-x
changeset: 5740:81b590b2d183
user:      David Grellscheid <david.grellscheid at durham.ac.uk>
date:      Wed May 03 10:24:39 2017 +0100
description:
Fix missing header to make gcc-7.1 builds work.

diffs (10 lines):

--- a/include/Rivet/Tools/RivetSTL.hh	Tue Apr 18 11:38:39 2017 +0100
+++ b/include/Rivet/Tools/RivetSTL.hh	Wed May 03 10:24:39 2017 +0100
@@ -19,6 +19,7 @@
 #include <iomanip>
 #include <cmath>
 #include <limits>
+#include <functional>
 
 
 #ifndef foreach