Let any bootstrap key suffice to allow features #37271
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This is a follow-up to pull request #32812, according to the new
decision in issue #36548 to relax bootstrap key logic. Now any
non-empty bootstrap key is allowed to circumvent the feature gate.
For now, the build system still goes through the same motions to set
RUSTC_BOOTSTRAP_KEY according to the prior system. This is necessary
at least until the next stage0 base includes this relaxed key check.
It also makes it simpler to revert this if we change our mind.