hw/xwin: Remove XSetAuthorization() for helper clients
All helper client code now uses xcb, so calling XSetAuthorization() is no longer needed. This is the last reference to libX11 from helper clients, so linking with x11-xcb and libX11 is no longer required. Also drop (unneeded?) linking with libXau. Also drop installing these prerequistes on AppvVeyor. Also move prototypes for functions in winauth.c from win.h into a new header, winauth.h, and include that where needed.
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