iucode_tool: do not scan-system while parsing
Instead of processing -s and -S/--scan-system while parsing, queue all filters so that we can call scan_system_processors() later. This was the only complex operation that was being carried out while parsing the command line. This change ensures that global options such as -q and -v, that are not supposed to be sensitive to their position in the command line, will work as expected.
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