configure: Check if ID3D11VideoDecoder exists, not just the header to enable d3d11va

Fixes build with some mingw-w64 versions, that have got the header
but not the interface declaration.

Signed-off-by: Martin Storsjö <martin@martin.st>

configure

@@ -1530,6 +1530,7 @@ TOOLCHAIN_FEATURES="
 TYPES_LIST="
     CONDITION_VARIABLE_Ptr
     DXVA_PicParams_HEVC
+    ID3D11VideoDecoder
     socklen_t
     struct_addrinfo
     struct_group_source_req
@@ -1983,7 +1984,7 @@ zmbv_decoder_deps="zlib"
 zmbv_encoder_deps="zlib"
 
 # hardware accelerators
-d3d11va_deps="d3d11_h dxva_h"
+d3d11va_deps="d3d11_h dxva_h ID3D11VideoDecoder"
 dxva2_deps="dxva2api_h"
 vaapi_deps="va_va_h"
 vda_deps="VideoDecodeAcceleration_VDADecoder_h pthreads"
@@ -4233,6 +4234,7 @@ check_lib2 "windows.h psapi.h" GetProcessMemoryInfo -lpsapi
 check_struct "sys/time.h sys/resource.h" "struct rusage" ru_maxrss
 
 check_type "windows.h dxva.h" "DXVA_PicParams_HEVC"
+check_type "windows.h d3d11.h" "ID3D11VideoDecoder"
 
 if ! disabled w32threads && ! enabled pthreads; then
     check_func_headers "windows.h process.h" _beginthreadex &&