[ob] Kill download_stratum

[Vladimir Prus]

I've checked in the below as obvious. download_stratum is not
used anywhere. Apparently, it was used by sparcl-tdep.c, which
got removed in 2004.

- Volodya

2008-04-08  Vladimir Prus  <vladimir@codesourcery.com>

	* target.h (enum strata): Remove the download_stratum.
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