Fix remove_double_dots_and_double_slashes removing all the dots leading http server to serve wrong URI

If the uri is something like '/js/...jquery.js', remove_double_dots_and_double_slashes will remove the 3 dots and the http server will serves the /js/jquery.js file.
remove_double_dots_and_double_slashes should check if a dot or double dots is followed by a slash (or backslash) and only remove this to avoid disclosure attack.

Enable building of example/Makefile on Win32

Compile fix

fix compiler warnings for 64 bit compilation

web_server_ssl

websocket_ssl_proxy sample for polarsll

OS/2 patches by KO Myung-Hun

Allow for compilation in Visual Studio with NS_ENABLE_IPV6.

Upstream patch from MAME project

Replace obsolete gethostbyname by getaddrinfo

Fix for MINGW builds

Only define _XOPEN_SOURCE on Linux.