fix socket option setting for windows (#1154)
fix socket option setting for windows (#1154)

* fix socket option setting for windows

* misc

Co-authored-by: zhangsen <3a38f7ba01319c55242a452f869bfcdb7f318f9d@cyberkl.com>
yhirose/cpp-httplib,yhirose/cpp-httplib,yhirose/cpp-httplib,yhirose/cpp-httplib