[libc-commits] [libc] [libc] Add proxy header for ENTRY type. (PR #139746)

[via libc-commits]

https://github.com/enh-google approved this pull request.

(fixing `libc/include/llvm-libc-types/ENTRY.h` in a separate change would make it easier to test that the rest of this actually works... i'll have to get the copybara config sorted so it excludes the llvm-libc-types files!)

https://github.com/llvm/llvm-project/pull/139746