compiler: Don't consider powerpc to have red zone support yet.

The command line flag is only supported in Clang 20: https://github.com/ziglang/zig/issues/23056

This gets rid of some warnings when using zig cc.
4fad60fd3aAlex Rønne Petersen committed on 3/3/2025, 6:36:46 PMparent6d29ef0
1 file changedLine totals unavailable