Debug Emscripten xeus-cpp Windows build

Author: mcbarton

.github/workflows/emscripten.yml

@@ -933,8 +933,9 @@ jobs:
         .\emsdk\emsdk activate ${{matrix.emsdk_ver}}
         .\emsdk\emsdk_env.ps1
         micromamba activate CppInterOp-wasm
-        git clone --depth=1 https://github.com/compiler-research/xeus-cpp.git
+        git clone --depth=1 https://github.com/mcbarton/xeus-cpp.git
         cd .\xeus-cpp
+        git checkout Enable-Windows-Emscripten-build 
         mkdir build
         pushd build
         $env:CMAKE_PREFIX_PATH=${{ env.PREFIX }}