Trevor Gross 013a83acdd Update licensing information after repository refactoring
In order to disambiguate things now that libm is part of the
compiler-builtins repository, do the following:

* Mention libm in LICENSE.txt
* Clarify the default license for crates other than libm and
  compiler-builtins
* Add an explicit license field to Cargo.toml for all other crates
2025-04-21 06:16:12 -04:00
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