Fix build with newer Boost.

Taken from upstream:

  https://github.com/fifengine/fifengine/commit/8072f18a9bf4e75c3e1b197b6ccda11e82954460

diff --git a/engine/core/vfs/zip/zipnode.cpp b/engine/core/vfs/zip/zipnode.cpp
--- a/engine/core/vfs/zip/zipnode.cpp
+++ b/engine/core/vfs/zip/zipnode.cpp
@@ -28,6 +28,7 @@
 #include "vfs/fife_boost_filesystem.h"
 
 #include "zipnode.h"
+#include <algorithm>
 
 namespace {
     /** helper function to find a value in a ZipNodeContainer
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<tr><td><span title='2018-09-03 18:21:43 +0200'>2018-09-03</span></td><td><a href='/guix/commit/gnu/packages/cpp.scm?id=cfcfc6ab627cbba2d5cd7893352e77d5e3667175'>Fix some typos.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-08-18 19:48:18 -0400'>2018-08-18</span></td><td><a href='/guix/commit/gnu/packages/cpp.scm?id=0bb41aec990832e8b022f7fbcd9586a39f39f9b4'>gnu: xtl: Update to 0.4.14.</a><span class='msg-avail'>...</span></td><td>Kei Kebreau</td></tr>
<tr><td><span title='2018-05-28 14:19:29 +0200'>2018-05-28</span></td><td><a href='/guix/commit/gnu/packages/cpp.scm?id=6f3c850618ff67d508addd1394a41401aa3be564'>gnu: Add xtl.</a><span class='msg-avail'>...</span></td><td>Fis Trivial</td></tr>
<tr><td><span title='2018-05-28 14:18:51 +0200'>2018-05-28</span></td><td><a href='/guix/commit/gnu/packages/cpp.scm?id=e3c0676adfb954f58b9237629d82ad2030159f40'>gnu: Add json-modern-cxx.</a><span class='msg-avail'>...</span></td><td>Fis Trivial</td></tr>
<tr><td><span title='2018-05-28 13:48:52 +0200'>2018-05-28</span></td><td><a href='/guix/commit/gnu/packages/cpp.scm?id=385357c0d7ebdb7102133095de1667f43ad00116'>gnu: Add fifo-map.</a><span class='msg-avail'>...</span></td><td>Fis Trivial</td></tr>
<tr><td><span title='2018-05-24 23:38:48 +0200'>2018-05-24</span></td><td><a href='/guix/commit/gnu/packages/cpp.scm?id=655ca71329ebdc44d78c3ee1f7b68d29ff6b273b'>gnu: Add xsimd.</a><span class='msg-avail'>...</span></td><td>Fis Trivial</td></tr>
<tr><td><span title='2018-01-30 16:40:28 +0100'>2018-01-30</span></td><td><a href='/guix/commit/gnu/packages/cpp.scm?id=2703135816c31d9bde4042da8d7863812e72fcd0'>gnu: Add Dashel.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-01-23 10:28:27 +0100'>2018-01-23</span></td><td><a href='/guix/commit/gnu/packages/cpp.scm?id=a893dc2f484f89d9f0ba21d44bdac3b792872781'>gnu: rct: Add missing headers, enable RTTI.</a><span class='msg-avail'>...</span></td><td>Fis Trivial</td></tr>
<tr><td><span title='2018-01-13 17:23:31 -0800'>2018-01-13</span></td><td><a href='/guix/commit/gnu/packages/cpp.scm?id=bad12e839c2f7823c45aa0121f7d5c9bb70905b7'>gnu: rct: Re-categorize some inputs.</a><span class='msg-avail'>...</span></td><td>Leo Famulari</td></tr>
<tr><td><span title='2018-01-13 17:11:49 -0800'>2018-01-13</span></td><td><a href='/guix/commit/gnu/packages/cpp.scm?id=e8b409741baf3b9de30faa8683722375196dd1e9'>gnu: Add rct.</a><span class='msg-avail'>...</span></td><td>Fis Trivial</td></tr>
<tr><td><span title='2018-01-10 15:59:46 +0100'>2018-01-10</span></td><td><a href='/guix/commit/gnu/packages/cpp.scm?id=c304543e07c0cd385588027deb59406631d3eb47'>gnu: libzen: Update to 0.4.37.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2017-09-04 00:10:59 -0400'>2017-09-04</span></td><td><a href='/guix/commit/gnu/packages/cpp.scm?id=d10092b849153dc27cfed0a9601fde6c7bdec918'>gnu: Put autoconf-related phases immediately after the 'unpack phase.</a><span class='msg-avail'>...</span></td><td>Kei Kebreau</td></tr>
<tr><td><span title='2017-05-31 17:08:45 +0200'>2017-05-31</span></td><td><a href='/guix/commit/gnu/packages/cpp.scm?id=17ce0d45bdf6089c78d90755d90589894275634f'>gnu: Add libzen.</a><span class='msg-avail'>...</span></td><td>Ethan R. Jones</td></tr>