winrt: Removed WinRT/Windows Phone/UWP support.

Fixes #10724.

src/misc/winrt/SDL_sysurl.cpp

@@ -1,38 +0,0 @@
-/*
-  Simple DirectMedia Layer
-  Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>
-
-  This software is provided 'as-is', without any express or implied
-  warranty.  In no event will the authors be held liable for any damages
-  arising from the use of this software.
-
-  Permission is granted to anyone to use this software for any purpose,
-  including commercial applications, and to alter it and redistribute it
-  freely, subject to the following restrictions:
-
-  1. The origin of this software must not be misrepresented; you must not
-     claim that you wrote the original software. If you use this software
-     in a product, an acknowledgment in the product documentation would be
-     appreciated but is not required.
-  2. Altered source versions must be plainly marked as such, and must not be
-     misrepresented as being the original software.
-  3. This notice may not be removed or altered from any source distribution.
-*/
-#include "SDL_internal.h"
-
-#include "../SDL_sysurl.h"
-#include "../../core/windows/SDL_windows.h"
-
-bool SDL_SYS_OpenURL(const char *url)
-{
-    WCHAR *wurl = WIN_UTF8ToStringW(url);
-    if (!wurl) {
-        return false;
-    }
-    auto strurl = ref new Platform::String(wurl);
-    SDL_free(wurl);
-
-    auto uri = ref new Windows::Foundation::Uri(strurl);
-    Windows::System::Launcher::LaunchUriAsync(uri);
-    return true; // oh well, we're not waiting on an async task here.
-}