[libc] [llvm] [libc] Add proxy header for float.h. (PR #93504)

[Nick Desaulniers via llvm-commits]

https://github.com/nickdesaulniers requested changes to this pull request.

ah, sorry, meant to wait until https://github.com/llvm/llvm-project/pull/93504/files#r1617623958 was resolved. Removing +1.

https://github.com/llvm/llvm-project/pull/93504