[clang] [clang-cl] Accept `cl`-style output arguments (`/Fo`, `-Fo`) for `--precompile` (PR #121046)

[Ben Boeckel via cfe-commits]

mathstuf wrote:

I don't really care how things are spelled as long as they're possible. Don't take what CMake does for `clang-cl` and modules as gospel as it is very much not declared as supported at all. We can rework how CMake constructs command lines for `clang-cl` and modules as needed.

https://github.com/llvm/llvm-project/pull/121046