gcj_submit_solution should return a success result

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This would help in automating my submitting script

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Original issue reported on code.google.com by `veltzerd...@gmail.com` on 6 Jun 2011 at 6:20

Start by locating the gcj_submit_solution entry point and reading how submission outcomes are currently handled. Check for related callers or tests that describe the expected result; done means an automated submitting script can distinguish a successful submission from other outcomes.

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