Don't include io.h on win32 when not necessary.
A few build fixes for MSVC.
* src/misc/win32_specific.c: try to load winsock2 instead of winsock1 when
present.
8 bit string under WinCE.
* ./extras/Win32_msvc: scrapped this directory.
* ./bootstrap: we now parse plugin makefiles to guess what to put in
the MSVC project files. Only the dummy plugin has been tested yet.
it simply outputs a usage message.
* ./src/*: fixed a bunch of (legitimate) warnings under VC++.
* ./evc/*, ./msvc/*: split the workspaces into three projects (libvlc, vlc
and plugins -- plugins doesn't build anything yet).
