cmake HAVE_IPPROTO_IPV6 examples

alibaba/AliSQL cmake/os/Windows.cmake :140 

CHECK_SYMBOL_EXISTS(IPPROTO_IPV6 "winsock2.h" HAVE_IPPROTO_IPV6)

arkdb/arkproxy cmake/os/Windows.cmake :139 

CHECK_SYMBOL_EXISTS(IPPROTO_IPV6 "winsock2.h" HAVE_IPPROTO_IPV6)

alibaba/AliSQLBackup cmake/os/Windows.cmake :138 

CHECK_SYMBOL_EXISTS(IPPROTO_IPV6 "winsock2.h" HAVE_IPPROTO_IPV6)