`swift-progress` doesn't build on M1 Macs, makes the installation fail

This is with the /usr/local x86 Homebrew:
```
arch -x86_64 brew install swiftxcode/swiftxcode/swift-xcode-wo
...
==> Installing swiftxcode/swiftxcode/swift-xcode-wo dependency: swiftxcode/swiftxcode/swift-progress
==> make all
...
clang: error: the clang compiler does not support '-march=nehalem'

** BUILD FAILED **
```
