Compile for x86_64 on macOS even with an arm64 host

We don't support arm64 on macOS yet.

Author: bjorn3

.github/workflows/abi-cafe.yml

@@ -51,6 +51,10 @@ jobs:
       if: matrix.env.TARGET_TRIPLE == 'x86_64-pc-windows-gnu'
       run: rustup set default-host x86_64-pc-windows-gnu
 
+    - name: Use x86_64 compiler on macOS
+      if: matrix.os == 'macos-latest' && matrix.env.TARGET_TRIPLE == 'x86_64-apple-darwin'
+      run: rustup set default-host x86_64-apple-darwin
+
     - name: Select XCode version
       if: matrix.os == 'macos-latest'
       run: sudo xcode-select -s /Applications/Xcode_14.3.1.app

.github/workflows/main.yml

@@ -98,6 +98,10 @@ jobs:
       if: matrix.os == 'windows-latest' && matrix.env.TARGET_TRIPLE == 'x86_64-pc-windows-gnu'
       run: rustup set default-host x86_64-pc-windows-gnu
 
+    - name: Use x86_64 compiler on macOS
+      if: matrix.os == 'macos-latest' && matrix.env.TARGET_TRIPLE == 'x86_64-apple-darwin'
+      run: rustup set default-host x86_64-apple-darwin
+
     - name: Install toolchain and emulator
       if: matrix.apt_deps != null
       run: |
@@ -234,6 +238,10 @@ jobs:
       if: matrix.os == 'windows-latest' && matrix.env.TARGET_TRIPLE == 'x86_64-pc-windows-gnu'
       run: rustup set default-host x86_64-pc-windows-gnu
 
+    - name: Use x86_64 compiler on macOS
+      if: matrix.os == 'macos-latest' && matrix.env.TARGET_TRIPLE == 'x86_64-apple-darwin'
+      run: rustup set default-host x86_64-apple-darwin
+
     - name: Install MinGW toolchain
       if: matrix.os == 'ubuntu-latest' && matrix.env.TARGET_TRIPLE == 'x86_64-pc-windows-gnu'
       run: |