fdo#53588 Assume cdir being in the last 1k of the file to speed-up search

Change-Id: I25291c52d9f0117c70c48781c2eb575bb6b374ff

shell/source/win32/zipfile/zipfile.cxx

@@ -264,6 +264,7 @@ static bool findCentralDirectoryEnd(StreamInterface *stream)
     if (!stream)
         return false;
     stream->sseek(0, SEEK_SET);
+    if (stream->sseek(-1024, SEEK_END)) stream->sseek(0, SEEK_SET);
     try
     {
         while (stream->stell() != -1)