Merge bitcoin/bitcoin#32184: ci: Add workaround for vcpkg's libevent package

30c59adda4 ci: Drop confusing comment (Hennadii Stepanov)
ef00a28414 ci: Add workaround for vcpkg's libevent package (Hennadii Stepanov)

Pull request description:

  This PR is necessary for Windows GHA [images](https://github.com/actions/runner-images/blob/win22/20250330.1/images/windows/Windows2022-Readme.md), which provide CMake >= 4.0.

  The idea has been taken from https://github.com/microsoft/vcpkg/pull/44273#discussion_r2009140242.

ACKs for top commit:
  maflcko:
    lgtm ACK 30c59adda4
  pinheadmz:
    ACK 30c59adda4

Tree-SHA512: 898a616a40c1aaec69d8a329d56f887cacec71b9588842feef2b689fbd21a12d8f8b3b4053a6373332008668960b9df7c71a44fcd97e637e250705daf1215c7f

.github/workflows/ci.yml

@@ -158,8 +158,6 @@ jobs:
 
   windows-native:
     name: ${{ matrix.job-name }}
-    # Use latest image, but hardcode version to avoid silent upgrades (and breaks).
-    # See: https://github.com/actions/runner-images#available-images.
     runs-on: windows-2022
 
     if: ${{ vars.SKIP_BRANCH_PUSH != 'true' || github.event_name == 'pull_request' }}
@@ -205,6 +203,8 @@ jobs:
         run: |
           echo "set(VCPKG_BUILD_TYPE release)" >> "${VCPKG_INSTALLATION_ROOT}/triplets/x64-windows.cmake"
           echo "set(VCPKG_BUILD_TYPE release)" >> "${VCPKG_INSTALLATION_ROOT}/triplets/x64-windows-static.cmake"
+          # Workaround for libevent, which requires CMake 3.1 but is incompatible with CMake >= 4.0.
+          sed -i '1s/^/set(ENV{CMAKE_POLICY_VERSION_MINIMUM} 3.5)\n/' "${VCPKG_INSTALLATION_ROOT}/scripts/ports.cmake"
 
       - name: vcpkg tools cache
         uses: actions/cache@v4