mbpoll: add cmake 4.x compatibility

Upstream backport.

Signed-off-by: Tianling Shen <cnsztl@immortalwrt.org>

utils/mbpoll/patches/010-cmake-Set-minimum-required-version-to-3-5-for-CMake-4.patch

@@ -0,0 +1,35 @@
+From baad0efca89f0d8fe370591283d87a6e8e7dee4c Mon Sep 17 00:00:00 2001
+From: Alper Ak <alperyasinak1@gmail.com>
+Date: Mon, 7 Jul 2025 20:05:36 +0300
+Subject: [PATCH] cmake: Set minimum required version to 3.5 for CMake 4+
+ compatibility
+
+Fix:
+
+| CMake Error at CMakeLists.txt:3 (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!
+
+Signed-off-by: Alper Ak <alperyasinak1@gmail.com>
+---
+ CMakeLists.txt | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -1,6 +1,6 @@
+ # -*- CMakeLists.txt generated by CodeLite IDE. Do not edit by hand -*-
+ 
+-cmake_minimum_required(VERSION 2.9)
++cmake_minimum_required(VERSION 3.5)
+ 
+ # Workspace name
+ project(mbpoll)