Fix windows static library build parameter in CMakeLists.txt

[MiyamuraMiyako]

Use cmake parameter set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>") to build windows static library.

[COM8]

@MiyamuraMiyako thanks for submitting this PR!

Could you please explain a bit why this is needed? I'm not so deep into msvc stuff.

Also please add a bit of inline comments what your code does and why it is needed.

[MiyamuraMiyako]

@COM8 The current Cmake configuration (-DBUILD_SHARED_LIBS=OFF) cannot compile a pure static library for Windows normally. By my test, need to add the configuration: set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>"). I think the message I output in cmake has explained the purpose of this modification.

if (MSVC)
    if (BUILD_SHARED_LIBS)
        message(STATUS "Build windows dynamic libs.")
    else()
        # Add this to build windows pure static library.
        set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
        message(STATUS "Build windows static libs.")
    endif()
endif()

[COM8]

Thanks! From what I can see, you have not yet pushed the comment to your CMake code. You just removed some Compiler definitions.

[MiyamuraMiyako]

@COM8 Ok, I add this comment to CMakeLists.txt