Brad King ef006ebd9b PCH: Use per-arch .pch files only when building multiple Apple architectures ...

Since commit f593b354da (PCH: Add support for multi architecture iOS
projects, 2020-04-02, v3.18.0-rc1~414^2) we use per-arch .pch files
even when compiling for just the host architecture on macOS arm64.
This breaks with compilers that do not support `-Xarch_` flags, such
as GCC.  Avoid using per-arch .pch files in single-architecture builds.

Fixes: #25514
Issue: #20497

2024-05-01 12:43:39 -04:00

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