Removed SDL_AndroidOpenURL, added SDL_OpenURL.

Still needs to be wired into Xcode and Visual Studio projects.

src/misc/windows/SDL_sysurl.c

@@ -0,0 +1,43 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 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 "../../core/windows/SDL_windows.h"
+
+/* https://msdn.microsoft.com/en-us/library/windows/desktop/bb762153%28v=vs.85%29.aspx */
+int
+SDL_SYS_OpenURL(const char *url)
+{
+    WCHAR* wurl = WIN_UTF8ToString(url);
+    int rc;
+
+    if (wurl == NULL) {
+        return SDL_OutOfMemory();
+    }
+
+    /* Success returns value greater than 32. Less is an error. */
+    rc = (int) ShellExecuteW(NULL, L"open", wurl, NULL, NULL, SW_SHOWNORMAL);
+    SDL_free(wurl);
+    return (rc > 32) ? 0 : WIN_SetError("Couldn't open given URL.");
+}
+
+/* vi: set ts=4 sw=4 expandtab: */
+