[clang] [MinGW] Fix the regression caused by commit 592e935e115ffb451eb9b782376711dab6558fe0, that, in MinGW, Clang can't be built by system Clang 15.0.4. (PR #74982)

[Martin Storsjö via cfe-commits]

mstorsjo wrote:

> I have build scripts and patches at: https://github.com/xu-chiheng/Note

This does not answer the question. You need to explain what is broken, and why, and how this fixes it. And address the concern that this actually breaks functionality in some cases. I guess this partially answers the question on in what exact environment the issue occurs, although it would require me to dissect your build script environment to figure it out.

https://github.com/llvm/llvm-project/pull/74982