Please link thread library for static build (same as shared build)

[toge]

Mosquitto: 2.0.20
Pthreads4w: 3.0.0
OS: Windows10
Compiler: MSVC 19.40.33812

I met a compilation error on static build due to lack of pthread.h.
It works fine with following hand patch.

if (WITH_THREADING)
  if(WIN32)
    target_link_libraries(libmosquitto_static PThreads4W::PThreads4W)
  else()
    set(THREADS_PREFER_PTHREAD_FLAG ON)
    find_package(Threads REQUIRED)
    target_link_libraries(libmosquitto_static Threads::Threads)
  endif()
endif()

Is it valid workaround or not?