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
.org/cgit-static/cgit.png' alt='cgit logo'/></a></td>
<td class='main'><a href='/'>index</a> : <a href='/guix/'>guix</a></td><td class='form'><form method='get'>
<input type='hidden' name='id' value='95bf2fb637ba4abb27efe94e0b671c1e93204e4f'/><select name='h' onchange='this.form.submit();'>
<option value='koszko' selected='selected'>koszko</option>
<option value='koszko-scripts'>koszko-scripts</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'></td></tr></table>
<table class='tabs'><tr><td>
<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=95bf2fb637ba4abb27efe94e0b671c1e93204e4f'>refs</a><a class='active' href='/guix/log/etc/snippets/scheme-mode/guix-cvs-reference'>log</a><a href='/guix/tree/etc/snippets/scheme-mode/guix-cvs-reference?id=95bf2fb637ba4abb27efe94e0b671c1e93204e4f'>tree</a><a href='/guix/commit/etc/snippets/scheme-mode/guix-cvs-reference?id=95bf2fb637ba4abb27efe94e0b671c1e93204e4f'>commit</a><a href='/guix/diff/etc/snippets/scheme-mode/guix-cvs-reference?id=95bf2fb637ba4abb27efe94e0b671c1e93204e4f'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/etc/snippets/scheme-mode/guix-cvs-reference'>
<input type='hidden' name='id' value='95bf2fb637ba4abb27efe94e0b671c1e93204e4f'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/log/?id=95bf2fb637ba4abb27efe94e0b671c1e93204e4f'>root</a>/<a href='/guix/log/etc?id=95bf2fb637ba4abb27efe94e0b671c1e93204e4f'>etc</a>/<a href='/guix/log/etc/snippets?id=95bf2fb637ba4abb27efe94e0b671c1e93204e4f'>snippets</a>/<a href='/guix/log/etc/snippets/scheme-mode?id=95bf2fb637ba4abb27efe94e0b671c1e93204e4f'>scheme-mode</a>/<a href='/guix/log/etc/snippets/scheme-mode/guix-cvs-reference?id=95bf2fb637ba4abb27efe94e0b671c1e93204e4f'>guix-cvs-reference</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/etc/snippets/scheme-mode/guix-cvs-reference?id=95bf2fb637ba4abb27efe94e0b671c1e93204e4f&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2017-12-15 23:15:32 +0100'>2017-12-15</span></td><td><a href='/guix/commit/etc/snippets/scheme-mode/guix-cvs-reference?id=42cdcdff1945b112452029c6a79445aac15ffd16'>etc: Add snippets.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/snippets/scheme-mode/guix-cvs-reference,
etc/snippets/scheme-mode/guix-git-reference,
etc/snippets/scheme-mode/guix-hg-reference,
etc/snippets/scheme-mode/guix-origin,
etc/snippets/scheme-mode/guix-package,
etc/snippets/scheme-mode/guix-svn-reference,
etc/snippets/text-mode/guix-commit-message-add-package,
etc/snippets/text-mode/guix-commit-message-update-package: New files.
* doc/contributing.texi (The Perfect Setup): Document snippets.
</span></span></td><td>Ricardo Wurmus</td></tr>