[PATCH] qicohandler cannot read windows cursor files (*.cur)

Qt plugin qico (qicohandler) cannot read windows cursor files (*.cur). CUR and ICO files are similar, changes is only in header ( see http://en.wikipedia.org/wiki/ICO_(file_format) ).
Problem is that ICOReader::canRead() check only for ICO header and refuse CUR files.
This simple patch (attached) fix this and after recompile Qt can read cur files.