Don't use the "-pie" link option in MSVC.

CMakeLists.txt

@@ -19,13 +19,13 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
 set(CMAKE_POSITION_INDEPENDENT_CODE TRUE)
 set(CMAKE_CXX_FLAGS "-Wall")
+
+if (NOT MSVC)
     if (CMAKE_POSITION_INDEPENDENT_CODE)
         include(CheckPIESupported)
         add_link_options("-pie")
         check_pie_supported()
     endif()
-
-if (NOT MSVC)
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pthread")
 endif()
 set(CMAKE_CXX_FLAGS_RELEASE "-Os")