Set cmake_minimum_required(VERSION) to 3.10 so that it works with cmake-4.
Bug: https://bugs.gentoo.org/954223

--- cJSON-1.7.18/CMakeLists.txt~	2025-04-22 21:00:57.000000000 +0200
+++ cJSON-1.7.18/CMakeLists.txt	2025-04-22 21:01:15.694382211 +0200
@@ -1,5 +1,5 @@
 set(CMAKE_LEGACY_CYGWIN_WIN32 0)
-cmake_minimum_required(VERSION 3.0)
+cmake_minimum_required(VERSION 3.10)
 
 project(cJSON
     VERSION 1.7.18