update libressl to version 4.2.0

[tgauth]

PR Summary

• bump libressl to latest version

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Pull Request Overview

Bumps LibreSSL dependency to 4.2.0 and updates associated build patches/resources for Windows (including ARM64 support).

• Updates version fields and resource file (version.rc) to 4.2.0.
• Adds ARM64 (aarch64) Windows CPU capability initialization and adjusts CMake logic for ARM/ARM64.
• Refreshes source archive checksum and applies new patch set.

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
contrib/win32/openssh/vcpkg_overlay_ports/libressl/vcpkg.json	Bumps LibreSSL version; retains existing port-version.
contrib/win32/openssh/vcpkg_overlay_ports/libressl/portfile.cmake	Updates source SHA512 and adds new aarch64 patch to extraction list.
contrib/win32/openssh/vcpkg_overlay_ports/libressl/modify-crypto-cmakelists.patch	Adds version.rc to COMPAT_SRC for Windows resource embedding.
contrib/win32/openssh/vcpkg_overlay_ports/libressl/modify-cmakelists.patch	Alters processor detection; injects system libs for ARM/ARM64 via CMAKE_C_STANDARD_LIBRARIES.
contrib/win32/openssh/vcpkg_overlay_ports/libressl/add-version-file.patch	Updates version numbers in resource file to 4.2.0.
contrib/win32/openssh/vcpkg_overlay_ports/libressl/aarch64-windows.diff	Introduces Windows-specific ARM64 CPU capabilities initialization source file.
contrib/win32/openssh/vcpkg.json	Updates referenced LibreSSL dependency version.

Comments suppressed due to low confidence (1)

contrib/win32/openssh/vcpkg_overlay_ports/libressl/modify-cmakelists.patch:1

• Modifying CMAKE_C_STANDARD_LIBRARIES directly in architecture condition blocks globally affects all targets and can lead to duplicated or unintended linkage; prefer appending these system libraries to an existing PLATFORM_LIBS variable or using target_link_libraries() on the specific LibreSSL targets for clearer scoping.

diff --git a/CMakeLists.txt b/CMakeLists.txt

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