This reverts most of commit e0013193.

My previous diagnosis was incorrect: Windows does support both getting
and setting IP_HDRINCL, but only on raw sockets. Very old versions of
Windows also accept it on UDP sockets.
Signed-off-by: Alex Henrie <alexhenrie24@gmail.com>
Signed-off-by: Zebediah Figura <zfigura@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>