[oe] can use x86_64 as an override

[Robert Schuster]

Hi,
it seems to be impossible to use x86_64 as an override. I want to
do this:

DEPENDS = "zlib-native classpath-initial jikes-initial"
DEPENDS_x86_64 += "libffi-native"

However when wvaluting this with "bitbake -i" libffi-native is not part
of the DEPENDS variable.

I guess it has something to do with the underscore in x86_64, right?

Perhaps we can fix this by sanitizing OVERRIDES by replacing all
underscores in its entries with a hyphen. At least for the above case
this would not be to bad.

Ideas?

Regards
Robert

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