[boost] Add UNIX domain sockets support for Windows

boostorg/asio#311

include/minapp/fwd.hpp

@@ -5,6 +5,27 @@
 #include <boost/asio/generic/stream_protocol.hpp>
 #include <boost/asio/io_context.hpp>
 
+
+// Windows does not support abstract unix domain sockets yet.
+// https://github.com/microsoft/WSL/issues/4240
+// https://github.com/boostorg/asio/pull/311
+// UNIX domain sockets.
+#if !defined(BOOST_ASIO_HAS_LOCAL_SOCKETS)
+# if !defined(BOOST_ASIO_DISABLE_LOCAL_SOCKETS)
+#  if !defined(BOOST_ASIO_WINDOWS_RUNTIME)
+#   define BOOST_ASIO_HAS_LOCAL_SOCKETS 1
+#  endif // !defined(BOOST_ASIO_WINDOWS_RUNTIME)
+# endif // !defined(BOOST_ASIO_DISABLE_LOCAL_SOCKETS)
+#endif // !defined(BOOST_ASIO_HAS_LOCAL_SOCKETS)
+
+#if defined(BOOST_ASIO_WINDOWS) && !defined(BOOST_ASIO_WINDOWS_RUNTIME) || defined(__CYGWIN__)
+namespace boost::asio::detail {
+struct sockaddr_un_type { unsigned short sun_family;
+  char sun_path[108]; }; /* copy from afunix.h */
+}
+#endif
+
+
 #define MINAPP_EXPORT BOOST_SYMBOL_EXPORT
 #define MINAPP_IMPORT BOOST_SYMBOL_IMPORT