- The Windows line-ending canonicalization was incomplete: we need to
canonicalize the manifest text itself too!
- The "meta deterministic check" runs the cranelift-codegen build script
N times outside of the source tree, examining what it produces to
ensure the output is always the same (is detministic). This works fine
when everything comes from the internal DSL, but when reading ISLE,
this breaks because we no longer have the ISLE source paths.
The initial ISLE integration did not hit this because without the
`rebuild-isle` feature, it simply did nothing in the build script;
now, with the manifest check, we hit the issue.
The fix for now is just to turn off all ISLE-specific behavior in the
build script by setting a special-purpose Cargo feature in the
specific CI job. Eventually IMHO we should remove or find a better way
to do this check.
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