feat(rules_toolchain): add triplet constraints
They are not _real_ constraints but `config_settings` which can be used in a `select` to switch on the triplet.
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They are not _real_ constraints but `config_settings` which can be used in a `select` to switch on the triplet.
mentioned in commit c490a13c
mentioned in commit 72dffa52
mentioned in commit c742d96b