package/cppdb: remove stale patch

Remove a stale patch which was not removed when the cppdb package was
removed by buildroot commit b7143b2e22.

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/cppdb/0002-CMakeLists.txt-fix-compatibility-with-CMake-4.patch

@@ -1,24 +0,0 @@
-From 27003c60a05dd3921538323a53b1650e289cba8c Mon Sep 17 00:00:00 2001
-From: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
-Date: Wed, 17 Dec 2025 22:27:33 +0100
-Subject: [PATCH] CMakeLists.txt: fix compatibility with CMake 4
-
-Upstream: N/A, dead upstream
-Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
----
- CMakeLists.txt | 2 +-
- 1 file changed, 1 insertion(+), 1 deletion(-)
-
-diff --git a/CMakeLists.txt b/CMakeLists.txt
-index 5e81b09..32ff3a6 100644
---- a/CMakeLists.txt
-+++ b/CMakeLists.txt
-@@ -1,4 +1,4 @@
--cmake_minimum_required(VERSION 2.6)
-+cmake_minimum_required(VERSION 3.5)
- project(cppdb)
- 
- set(CPPDB_MAJOR 0)
--- 
-2.52.0
-