utils/math.h: add missing include

Sven Verdoolaege · Sven Verdoolaege · commit 471c5404df48 · 2018-04-11T14:08:01.000+02:00
std::nth_element is in &lt;algorithm&gt;.
diff --git a/tc/core/utils/math.h b/tc/core/utils/math.h
@@ -15,6 +15,7 @@
  */
 #pragma once
 
+#include <algorithm>
 #include <exception>
 
 namespace tc {
