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.

Fixes the build on NetBSD.

The comment says it's only needed on Linux, and AFAIK Linux
is the only operating system that only adds symbols when it's defined;
others, like NetBSD or Solaris, also hide symbols.
Signed-off-by: Thomas Klausner <wiz@NetBSD.org>

Replaced tabs with spaces.

This also protect against the latest glibc bug

Update Makefile

Fixing typo in 'clean' section