[oe] Uppercase overrides and parsing speed

[Marcin Juszkiewicz]

Dnia Saturday, 23 of February 2008, Koen Kooi napisał:
> Richard Purdie schreef:
> | Hi,
> |
> | At OEDEM I mentioned that we might have some speed gain if bitbake
> | could more easily tell what constituted an override. All current
> | overrides are lower case and we don't have any in upper case.
>
> Didn't we also agree that variable names shouldn't include '_' at all?

We did, but this patch from Richard improves current situation without 
doing search/replace on whole metadata and users configs.

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