dev-libs/json-c: Sync with Gentoo

It's from Gentoo commit cf7e79a152bf94c77fb5bd517564686ecef4b7c0.

sdk_container/src/third_party/portage-stable/dev-libs/json-c/files/0.18.0-cmake4.patch

@@ -0,0 +1,25 @@
+
+From: https://github.com/json-c/json-c/pull/888
+Bug: https://bugs.gentoo.org/958972
+
+From 42864e12b0d7af01b1cf989d6da9e9a4477775a1 Mon Sep 17 00:00:00 2001
+From: Rudi Heitbaum <rudi@heitbaum.com>
+Date: Fri, 28 Mar 2025 23:14:48 +1100
+Subject: [PATCH] Allow build with cmake 4.0.0
+
+Update the min version to match parent CMakeLists.txt 3.9...3.12
+---
+ apps/CMakeLists.txt | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/apps/CMakeLists.txt b/apps/CMakeLists.txt
+index f7c9dec633..ef2271d131 100644
+--- a/apps/CMakeLists.txt
++++ b/apps/CMakeLists.txt
+@@ -1,5 +1,5 @@
+ 
+-cmake_minimum_required(VERSION 2.8)  # see ../CMakeLists.txt for why 2.8
++cmake_minimum_required(VERSION 3.9...3.12)
+ 
+ if(POLICY CMP0075)
+     cmake_policy(SET CMP0075 NEW)

sdk_container/src/third_party/portage-stable/dev-libs/json-c/json-c-0.18.ebuild

@@ -30,6 +30,8 @@ MULTILIB_WRAPPED_HEADERS=(
 	/usr/include/json-c/config.h
 )
 
+PATCHES=( "${FILESDIR}/0.18.0-cmake4.patch" )
+
 multilib_src_configure() {
 	# Tests use Valgrind automagically otherwise (bug #927027)
 	export USE_VALGRIND=0

sdk_container/src/third_party/portage-stable/dev-libs/json-c/json-c-9999.ebuild

@@ -30,6 +30,8 @@ MULTILIB_WRAPPED_HEADERS=(
 	/usr/include/json-c/config.h
 )
 
+PATCHES=( "${FILESDIR}/0.18.0-cmake4.patch" )
+
 multilib_src_configure() {
 	# Tests use Valgrind automagically otherwise (bug #927027)
 	export USE_VALGRIND=0