libgo patch committed: If we called opendir, call closedir

[Ian Lance Taylor]

This libgo patch ensures that if we called opendir using an os.File, we
call closedir if we close the file.  This fixes
http://code.google.com/p/go/issues/detail?id=1448 .  Bootstrapped and
ran Go testsuite on x86_64-unknown-linux-gnu.  Committed to mainline.

Ian

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