package/cjson: fix cmake 4 compatibility

Add a patch fixing cmake 4 compatibility, found in upstream pull
request #935.

Fixes:

  https://autobuild.buildroot.org/results/e7e/e7e427b90718a5fc4985e2718e8b629bba672390

Signed-off-by: Benoît Monin <benoit.monin@bootlin.com>
[Romain: add links to autobuilder failures in commit log]
Signed-off-by: Romain Naour <romain.naour@smile.fr>

package/cjson/0001-make_compatible_with_cmake_4.0.patch

@@ -0,0 +1,34 @@
+From 58bc7c823c2e39f1a626ec4da86952bc6819bd6b Mon Sep 17 00:00:00 2001
+From: Markus Vieth <mvieth@techfak.uni-bielefeld.de>
+Date: Sun, 30 Mar 2025 11:12:07 +0200
+Subject: [PATCH] Make compatible with CMake 4.0 When trying to build with
+ CMake 4.0, the following error is shown:
+
+CMake Error at CMakeLists.txt:2 (cmake_minimum_required):
+  Compatibility with CMake < 3.5 has been removed from CMake.
+
+  Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
+  to tell CMake that the project requires at least <min> but has been updated
+  to work with policies introduced by <max> or earlier.
+
+  Or, add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to try configuring anyway.
+
+This change raises the minimum required CMake version to 3.5 and thus makes the project compatible with CMake 4.0
+
+Signed-off-by: Benoît Monin <benoit.monin@bootlin.com>
+Upstream: https://github.com/DaveGamble/cJSON/pull/935
+---
+ CMakeLists.txt | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 36a6cb57..9428da58 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -1,5 +1,5 @@
+ set(CMAKE_LEGACY_CYGWIN_WIN32 0)
+-cmake_minimum_required(VERSION 3.0)
++cmake_minimum_required(VERSION 3.5)
+ 
+ project(cJSON
+     VERSION 1.7.18