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Don't ever claim /dev/null is an execpath.
SpawnInputExpander.EMPTY_FILE claimed an execpath of /dev/null, which could lead to clients trying to do mutating filesystem operations in /dev. In this change, SpawnInputExpander.EMPTY_FILE is replaced with an EmptyVirtualInput with no execpath. This way errant callers will explode before trying filesystem operations on it. Such a EmptyVirtualInput doesn't really meet the contract of being an ActionInput but that was really already true. Closes bazelbuild#12516. PiperOrigin-RevId: 350427786
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