llvm-project

44331d25 - [libc++][C++03] Remove some of the C++03-specific C wrapper headers (#163772)

[libc++][C++03] Remove some of the C++03-specific C wrapper headers (#163772) `include_next` doesn't work very well with the C++03 headers and modules. Since these specific headers are very self-contained there isn't much of a reason to split them into C++03/non-C++03 headers, so let's just remove them. The few C wrapper headers that aren't as self-contained will be refactored in a separate patch.