extrac32: enhance command-line parsing

[Andrey Turkin]

Flags can be supplied in any order, optional filenames may be specified.
Should fix bug 18097 (this time for real :))
---
  programs/extrac32/extrac32.c |   21 ++++++++++++++-------
  1 files changed, 14 insertions(+), 7 deletions(-)


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