[libc] [llvm] [libc] Add proxy header for fenv.h macro constants. #87863 (PR #87896)

[via llvm-commits]

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@@ -1,7 +1,7 @@
 set(TARGET_PUBLIC_HEADERS
     libc.include.assert
     libc.include.ctype
-    libc.include.fenv
+    libc.hdr.fenv_macros
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lntue wrote:

Don't change `libc.include.fenv` in the `libc/config` folder, they are for registering the headers for full build modes.

https://github.com/llvm/llvm-project/pull/87896