Without <limits.h>, INT_MAX is not defined.

diff --git a/transport.hxx b/transport.hxx
index 35a57a7..838add6 100644
--- a/transport.hxx
+++ b/transport.hxx
@@ -11,6 +11,7 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <string.h>
+#include <limits.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
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<tr><td><span title='2018-03-20 19:49:47 +0100'>2018-03-20</span></td><td><a href='/guix/commit/gnu/packages/lego.scm?id=324f192700b2b64631ced0d05576eeb1d2cf6918'>gnu: leocad: Use HTTPS home page.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/lego.scm (leocad)[home-page]: Use HTTPS.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-03-20 19:49:47 +0100'>2018-03-20</span></td><td><a href='/guix/commit/gnu/packages/lego.scm?id=84775d65a8aedcb8308c74d4ac7223f02d8fdd3e'>gnu: leocad: Update phase style.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/lego.scm (leocad)[arguments]: Substitute INVOKE for
SYSTEM* and end all phases with an explicit #t.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-03-20 19:49:46 +0100'>2018-03-20</span></td><td><a href='/guix/commit/gnu/packages/lego.scm?id=b5df3e266b8db0c2da9f70e317349c90dac30623'>gnu: leocad: Update to 18.02.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/lego.scm (leocad): Update to 18.02.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2017-08-03 00:33:02 -0500'>2017-08-03</span></td><td><a href='/guix/commit/gnu/packages/lego.scm?id=68a29ab8d00be37f5e084d16a8971d7cf5fb2714'>gnu: Add LeoCAD.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/lego.scm (leocad): New variable.
</span></span></td><td>Eric Bavier</td></tr>