Dongsu Park 325b2f09e2 dev-lang/rust: remove duplicates, move to coreos-overlay
`dev-lang/rust` has been moved to coreos-overlay since a long time.
However, we have still kept `dev-lang/rust` in portage-stable as well.
As it is not needed at all, let's simply remove it.
2020-04-29 16:28:21 +02:00
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