swift build failure on Windows ARM64

### Is it reproducible with SwiftPM command-line tools: `swift build`, `swift test`, `swift package` etc? - [x] Confirmed reproduction steps with SwiftPM CLI. The description text _must_ include reproduction steps with either of command-line SwiftPM commands, `swift build`, `swift test`, `swift package` etc. ### Description Reproduction steps ### Expected behavior No build failure Build failure _No response_ ### Steps to reproduce - Install a recent main-branch toolchain build, for example, https://ci-external.swift.org/job/swift-main-windows-toolchain-arm64/1969/artifact/build/artifacts/ - Build swift-win32 ``` git clone https://github.com/compnerd/swift-win32 cd swift-win32 swift build error: failed to load toolchain: toolchain 'com.apple.dt.toolchain.XcodeDefault' already registered from C:\Users\hiroshi\AppData\Local\Programs\Swift\Toolchains\0.0.0+NoAsserts error: failed to load toolchain: toolchain 'com.apple.dt.toolchain.XcodeDefault' already registered from C:\Users\hiroshi\AppData\Local\Programs\Swift\Toolchains\0.0.0+NoAsserts error: Could not initialize build system ``` ### Swift Package Manager version/commit hash _No response_ ### Swift & OS version (output of `swift --version ; uname -a`) Windows ARM64