Revert "Check if dxva2api.h is recent enough to compile vc1_dxva2_hwaccel."

This reverts commit 9104cd51.
Revert requested by ramiro

Conflicts:

	configure

configure

@@ -1373,7 +1373,7 @@ tscc_decoder_select="zlib"
 twinvq_decoder_select="mdct lsp sinewin"
 vc1_decoder_select="h263_decoder"
 vc1_crystalhd_decoder_select="crystalhd"
-vc1_dxva2_hwaccel_deps="dxva2api_h DXVA_PictureParameters_wDecodedPictureIndex"
+vc1_dxva2_hwaccel_deps="dxva2api_h"
 vc1_dxva2_hwaccel_select="dxva2 vc1_decoder"
 vc1_vaapi_hwaccel_select="vaapi vc1_decoder"
 vc1_vdpau_decoder_select="vdpau vc1_decoder"
@@ -2865,8 +2865,6 @@ check_header vdpau/vdpau.h
 check_header vdpau/vdpau_x11.h
 check_header X11/extensions/XvMClib.h
 
-check_struct dxva2api.h DXVA_PictureParameters wDecodedPictureIndex
-
 disabled  zlib || check_lib   zlib.h      zlibVersion -lz   || disable  zlib
 disabled bzlib || check_lib2 bzlib.h BZ2_bzlibVersion -lbz2 || disable bzlib