Consider MIT WITH Musl-Exception as a single permissive license

```
In addition, permission is hereby granted for all public header files
(include/* and arch/*/bits/*) and crt files intended to be linked into
applications (crt/*, ldso/dlstart.c, and arch/*/crt_arch.h) to omit
the copyright notice and permission notice otherwise required by the
license, and to use these files without any requirement of
attribution. These files include substantial contributions from:
```

It waives up the copyright restriction otherwise imposed by MIT license.
There is no need to forbid this license.

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