std::format for MacOS ARM

Author: howetuft

.github/workflows/wheels.yml

@@ -179,8 +179,6 @@ jobs:
         if: runner.os == 'macOS'
         shell: bash
         run: |
-          xcodebuild -find clang++
-/Applications/Xcode_15.4.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++
           if [[ '${{ runner.arch }}' == 'X64' ]]; then
             echo "PKG_ARCH=x86_64" >> $GITHUB_ENV
           else
@@ -189,7 +187,7 @@ jobs:
 
           #echo "CC=$(brew --prefix llvm@15)/bin/clang" >> "$GITHUB_ENV"
           #echo "CXX=$(brew --prefix llvm@15)/bin/clang++" >> "$GITHUB_ENV"
-          _TC="${XCODE_16_DEVELOPER_DIR}/Toolchains/XcodeDefault.xctoolchain"
+          _TC=${XCODE_16_DEVELOPER_DIR}/Toolchains/XcodeDefault.xctoolchain
           echo "CC=${_TC}/usr/bin/clang" >> "$GITHUB_ENV"
           echo "CXX=${_TC}/usr/bin/clang++" >> "$GITHUB_ENV"
           echo "MACOSX_DEPLOYMENT_TARGET=13.13" >> "$GITHUB_ENV"