[compiler-rt] [builtins] Avoid using long double in generic sources (PR #69754)

[Nico Weber via llvm-commits]

nico wrote:

This seems to not build on Windows, at least with clang-cl as host compiler: http://45.33.8.238/win/85105/step_4.txt

Could you take a look?

https://github.com/llvm/llvm-project/pull/69754