Revert "make a .rsp file for `zig clang`"

This reverts commit 9db293492bbbc5b8d70638bd9c59dea19d13596c.

It's not OK to call `realpath` in the compiler.

Reopens #12419
9bcd48e40eAndrew Kelley committed on 1/2/2023, 11:31:45 PMparentdf5fcf5
2 files changedLine totals unavailable