Add UNIX domain sockets, POSIX stream-oriented descriptors and Windows

stream-oriented handles to the reference documentation.


[SVN r44682]

libs/asio

@@ -1 +1 @@
-Subproject commit 4ef94bda423e1f1eb2c12e103c5364a7420c6837
+Subproject commit 0d06a870888826be4b5e2874e90084dedd6dfb07