[llvm] [LLVM][CMake] Set LANG to "C" before linker detection. (PR #95913)

[Carlo Bramini via llvm-commits]

carlo-bramini wrote:

Adding `${CMAKE_COMMAND} -E env LANG=C` also worked fine and it fixes the original issue.
Since your solution looks more cleaner, I updated the patch and I added a comment with the explanation of the change.


https://github.com/llvm/llvm-project/pull/95913