Fix CVE-2018-10963:

http://bugzilla.maptools.org/show_bug.cgi?id=2795
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-10963

Patch copied from upstream source repository:

https://gitlab.com/libtiff/libtiff/commit/de144fd228e4be8aa484c3caf3d814b6fa88c6d9

From de144fd228e4be8aa484c3caf3d814b6fa88c6d9 Mon Sep 17 00:00:00 2001
From: Even Rouault <even.rouault@spatialys.com>
Date: Sat, 12 May 2018 14:24:15 +0200
Subject: [PATCH] TIFFWriteDirectorySec: avoid assertion. Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2795. CVE-2018-10963

---
 libtiff/tif_dirwrite.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/libtiff/tif_dirwrite.c b/libtiff/tif_dirwrite.c
index 2430de6d..c15a28db 100644
--- a/libtiff/tif_dirwrite.c
+++ b/libtiff/tif_dirwrite.c
@@ -695,8 +695,11 @@ TIFFWriteDirectorySec(TIFF* tif, int isimage, int imagedone, uint64* pdiroff)
 								}
 								break;
 							default:
-								assert(0);   /* we should never get here */
-								break;
+								TIFFErrorExt(tif->tif_clientdata,module,
+								            "Cannot write tag %d (%s)",
+								            TIFFFieldTag(o),
+                                                                            o->field_name ? o->field_name : "unknown");
+								goto bad;
 						}
 					}
 				}
-- 
2.17.0

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<tr><td><span title='2014-11-17 18:58:38 +0100'>2014-11-17</span></td><td><a href='/guix/commit/doc.am?id=c6fabc5e5798b9ab42578d0f98df77651137953c'>build: Add doc/emacs.texi to the distribution.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2014-07-24 23:50:55 +0200'>2014-07-24</span></td><td><a href='/guix/commit/doc.am?id=931c132a58d86287d7a73964f9731a3b578538cc'>doc: Make sure out-of-source-tree builds find os-config.tmpl.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2013-10-18 22:05:39 +0200'>2013-10-18</span></td><td><a href='/guix/commit/doc.am?id=02c72d167116fb56360cbe7f9b80a8b33284ae6f'>build: Build the bootstrap-graph.{png,eps,pdf} under $(top_srcdir).</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>