Add missing header to queue.cc for new clang

Change-Id: I225dfd9d46866b53898771c431bf29293e4a5573
Signed-off-by: Austin Schuh <austin.linux@gmail.com>
diff --git a/motors/usb/queue.cc b/motors/usb/queue.cc
index 82fa32f..270ad74 100644
--- a/motors/usb/queue.cc
+++ b/motors/usb/queue.cc
@@ -2,6 +2,8 @@
 
 #include <string.h>
 
+#include <algorithm>
+
 namespace frc971 {
 namespace teensy {