avutil/hwcontext_d3d11va: remove check for d3d11 debug layer dll

At least on latest Win 11 and Visual Studio 2022, that DLL does not
exist anymore and can't be installed via any of the usual means.
However, debugging works just fine regardless, so this check makes
debugging impossible.

D3D11CreateDevice will fail anyway if debugging is not supported, so
let's rely on that instead.

libavutil/hwcontext_d3d11va.c

@@ -612,14 +612,10 @@ static int d3d11va_device_create(AVHWDeviceContext *ctx, const char *device,
     int ret;
     int adapter = -1;
 
-    // (On UWP we can't check this.)
-#if !HAVE_UWP
-    if (!LoadLibrary("d3d11_1sdklayers.dll"))
-        is_debug = 0;
-#endif
-
-    if (is_debug)
+    if (is_debug) {
         creationFlags |= D3D11_CREATE_DEVICE_DEBUG;
+        av_log(ctx, AV_LOG_INFO, "Enabling d3d11 debugging.\n");
+    }
 
     if ((ret = ff_thread_once(&functions_loaded, load_functions)) != 0)
         return AVERROR_UNKNOWN;