Commits on Mar 1, 2021

1. Change built-in kernel targets to be os = none throughout …

   Whether for Rust's own `target_os`, LLVM's triples, or GNU config's, the
   OS-related have fields have been for code running *on* that OS, not code
   that is *part* of the OS.
   
   The difference is huge, as syscall interfaces are nothing like
   freestanding interfaces. Kernels are (hypervisors and other more exotic
   situations aside) freestanding programs that use the interfaces provided
   by the hardware. It's *those* interfaces, the ones external to the
   program being built and its software dependencies, that are the content
   of the target.
   
   For the Linux Kernel in particular, `target_env: "gnu"` is removed for
   the same reason: that `-gnu` refers to glibc or GNU/linux, neither of
   which applies to the kernel itself.
   
   Relates to rust-lang#74247
   
   Thanks @ojeda for catching some things.

   

   Ericson2314 committed Mar 1, 2021
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