libtiff: doc/index.rst: add warning about tools removal

From f438759105c02904ba5578ffad9e214e5a3649fb Mon Sep 17 00:00:00 2001
From: Even Rouault <[EMAIL REDACTED]>
Date: Tue, 5 Sep 2023 23:06:24 +0200
Subject: [PATCH] doc/index.rst: add warning about tools removal

 doc/index.rst | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/doc/index.rst b/doc/index.rst
index 8d3061e6..81355ccf 100644
--- a/doc/index.rst
+++ b/doc/index.rst
@@ -34,6 +34,16 @@ your needs for reading and writing TIFF images.
 LibTIFF is portable software, supported on various operating systems including
 UNIX (Linux, BSD, MacOS X) and Windows.
+.. warning::
+    Starting with libtiff v4.6.0, the source code for most TIFF tools (except tiffinfo,
+    tiffdump, tiffcp and tiffset) was discontinued, due to the lack of contributors
+    able to address reported security issues.
+    It will still be available in the source distribution, but they
+    will no longer be built by default, and issues related to them
+    will no longer be accepted in the libtiff bug tracker.
 The following sections are included in this documentation:
 .. toctree::