- Validate and canonicalize source-filter address

   must be set to 1 for DVB subtitles.

and that signals never disturb our innocent blocking system call callers
(such as network I/O)

 * skins2/controls/ctrl_text.cpp: Fixed weird behaviours occurring when resizing a Text control with moving text

This is no excuse for using TCP instead of UDP/UDP-Lite when you can.

Fortunately, the harm potential of this old bug seems pretty low

- getaddrinfo.c: use Win32 shim functions to load getnameinfo/getaddrinfo/freeaddrinfo on first call, cleaner than a bunch of if/else in user functions
- announce.c: freeaddrinfo -> vlc_freeaddrinfo

Compile fix. In mingw32 there is a sys/time.h with struct timeval. Someone under cygwin should test.

Refs: #900 #920 #1031