bjorn3 53852ee4eb Move most of unwind's build script to lib.rs
Only the android libunwind detection remains in the build script

* Reduces dependence on build scripts for building the standard library
* Reduces dependence on exact target names in favor of using semantic
  cfg(target_*) usage.
* Keeps almost all code related to linking of the unwinder in one file
2022-11-14 14:24:12 +00:00
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