Grothoff's massive indentation and documentation fixes in util/network.c

git-svn-id: https://gnunet.org/svn/gnunet@34552 140774ce-b5e7-0310-ab8b-a85725594a96
Grothoff's W32 select slist elimination and prettification

git-svn-id: https://gnunet.org/svn/gnunet@34553 140774ce-b5e7-0310-ab8b-a85725594a96