package/mrp: fix cmake 4 compatibility

Fixes:
https://autobuild.buildroot.net/results/d93/d938025a881a14003c1b50065f163115e36cf33e/

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Reviewed-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Reviewed-by: Michael Cullen <michael@michaelcullen.name>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/mrp/0001-cmake-Set-minimum-required-version-to-3.5-for-CMake-.patch

@@ -0,0 +1,41 @@
+From 23877eaf1042b56e1bdca1883447e9a83d5e8263 Mon Sep 17 00:00:00 2001
+From: Bernd Kuhls <bernd@kuhls.net>
+Date: Sun, 18 Jan 2026 14:26:05 +0100
+Subject: [PATCH] cmake: Set minimum required version to 3.5 for CMake 4+
+ compatibility
+
+Fixes:
+CMake Error at CMakeLists.txt:6 (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.
+
+-- Configuring incomplete, errors occurred!
+
+Upstream: https://github.com/microchip-ung/mrp/pull/2
+
+Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
+---
+ CMakeLists.txt | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index d7a3798..a0ae196 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -3,7 +3,7 @@
+ 
+ project (mrp C)
+ 
+-cmake_minimum_required(VERSION 2.6)
++cmake_minimum_required(VERSION 3.5)
+ 
+ ## libnl ################################################
+ find_path(LibNL_INCLUDE_DIR netlink/netlink.h
+-- 
+2.47.3
+