Rename windows binary to end with x86_64 instead of x86

We are 64bit only.

CMakeModules/CPackConfiguration.cmake

@@ -7,7 +7,7 @@ set(CPACK_PACKAGE_VERSION_PATCH ${VERSION_NANO})
 if(APPLE)
   set(CPACK_SYSTEM_NAME "macosx-x86_64")
 elseif(WIN32)
-  set(CPACK_SYSTEM_NAME "windows-x86")
+  set(CPACK_SYSTEM_NAME "windows-x86_64")
 else()
   set(CPACK_SYSTEM_NAME linux-${CMAKE_HOST_SYSTEM_PROCESSOR})
 endif()