feat: add macro to declare unstable constants#5180
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This patch adds a new macro that can be used for declaring constants when these are known to possibly change upstream across target OS/ABI versions.
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Description
This PR adds a new macro that should align with the new usage guidelines in #5179.
This macro is meant to be used with constants that are likely to suffer from SemVer-breaking changes but which the new usage guidelines accept as being part of stable
libccrate relases.It has been used in #5118, #5119, #5120, #5121, #5122 and #5123.
While that PR gets merged, this PR will be left as a draft. The reason for that is that the link to the usage guidelines may change until #5179 is complete.
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Checklist
libc-test/semverhave been updated*LASTor*MAXare included (see #3131)cd libc-test && cargo test --target mytarget); especially relevant for platforms that may not be checked in CI@rustbot label +stable-nominated