Update CMakeLists.txt

[lhmouse]

pthread has been checked in build/cmake/CMakeLists.txt; there's no need to check it again.

On Windows, zstd can be built without winpthreads. It may check for existence of a pthread library, but nothing is linked from it. However, this causes errors when no pthread library is available.

Either way, this check isn't meaningful.

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[Copilot]

Pull request overview

This PR updates the CMake build for the pzstd contrib target to stop hard-failing when CMake detects a non-pthreads threading implementation (notably on Windows), aligning with the project’s ability to build on Windows without linking a pthread library.

Changes:

• Remove the CMAKE_USE_PTHREADS_INIT gating and associated SEND_ERROR for pzstd.
• Always link pzstd against ${CMAKE_THREAD_LIBS_INIT} (which may be empty on platforms where no extra thread lib is needed).

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