[libc-commits] [libc] [libc][stdfix] Generate stdfix.h header with fixed point precision macros according to N1169 standard, and add fixed point type support detection. (PR #81255)

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lntue wrote:

> Is there some way to make it more explicit in our source filesystem layout that stdfix.h is not part of the standard library, but is instead an extension?
> 
> Could we have an extensions directory where we keep our extensions neatly separated from the rest of the standardized standard library?

Moved them to `stdc_ext.td` instead.

https://github.com/llvm/llvm-project/pull/81255