GWinHTTPVfs: use URI parser for parsing URIs

If a URI can't be handled by by WinHTTPVfs, it should pass that URI
along to the URI parser of the wrapped Vfs, not to its generic parser.
Theoretically, generic parser should also be able to handle URIs,
but this is subject to Vfs semantics.

In case of Windows, the wrapped Vfs is GLocalVfs, which is *local* and
treats any generic names as either file:// URIs or as filesystem
paths. It only ever treats URIs as URIs when they are passed
to its URI parser. This breaks the testsuite when g-icon GIO test passes
unhandleable sftp:// URI, and expects it to come through unmolested,
yet GLocalVfs, getting that URI as a generic parse name, treats it as
a filesystem path, and then "canonicalizes" it by prepending CWD.

Fix this by making WinHTTPVfs pass any URIs it gets to the URI parser
of the wrapped Vfs. This way unknown URIs remain URI-ish. This seems
like a reasonable things to do, since the URI parser should not be
given anything other than URIs, so there's no reason to try generic
parsing with these strings.

Closes: #875

gio/win32/gwinhttpvfs.c

@@ -173,7 +173,7 @@ g_winhttp_vfs_get_file_for_uri (GVfs       *vfs,
       return _g_winhttp_file_new (winhttp_vfs, uri);
 
   /* For other URIs fallback to the wrapped GVfs */
-  return g_vfs_parse_name (winhttp_vfs->wrapped_vfs, uri);
+  return g_vfs_get_file_for_uri (winhttp_vfs->wrapped_vfs, uri);
 }
 
 static const gchar * const *