ci: add --cfg for cargo doc to disable compile_error!() #195
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Some crates, such as vhost, use compile_error!() to indicate that mutually exclusive feature have been specified. This leads to problems when running cargo doc --all-features, which will inevitably trigger these conditions and then lead to documentation not building (for this reason, the vhost documentation currently fails to build on docs.rs for example).
Add a custom cfg that gets passed via RUSTFLAGS in the cargo doc CI step on whose absense these compile_error!() macros can be gated, so that they dont cause issues when building documentation in CI
See also rust-vmm/vhost#326
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