Merge pull request #855 from 5tefan/fix_cmake

Fix cmake when CMAKE_SIZEOF_VOID_P udnefined

cmake/FindWinSock.cmake

@@ -74,7 +74,7 @@ if(MINGW)
     list(APPEND WINSOCK_LIBRARY_PATHS "${CMAKE_MATCH_1}")
   endif()
 endif()
-if (${CMAKE_HOST_SYSTEM_PROCESSOR} STREQUAL "AMD64" AND ${CMAKE_SIZEOF_VOID_P} EQUAL 4)
+if (${CMAKE_HOST_SYSTEM_PROCESSOR} STREQUAL "AMD64" AND "${CMAKE_SIZEOF_VOID_P}" EQUAL 4)
   list(APPEND WINSOCK_LIBRARY_PATHS "C:/Windows/SysWOW64")
 endif()
 list(APPEND WINSOCK_LIBRARY_PATHS "C:/Windows/System32")