Update emscripten.yml

Author: mcbarton

.github/workflows/emscripten.yml

@@ -943,16 +943,16 @@ jobs:
         git checkout Enable-Windows-Emscripten-build 
         mkdir build
         pushd build
-        $env:CMAKE_PREFIX_PATH=${{ env.PREFIX }}
-        $env:CMAKE_SYSTEM_PREFIX_PATH=${{ env.PREFIX }}
+        $env:CMAKE_PREFIX_PATH="${{ env.PREFIX }}"
+        $env:CMAKE_SYSTEM_PREFIX_PATH="${{ env.PREFIX }}"
         emcmake cmake `
           -DCMAKE_BUILD_TYPE=${{ env.BUILD_TYPE }}          `
           -DCMAKE_PREFIX_PATH=${{ env.PREFIX }}             `
           -DCMAKE_INSTALL_PREFIX=${{ env.PREFIX }}          `
           -DXEUS_CPP_EMSCRIPTEN_WASM_BUILD=ON               `
           -DCMAKE_FIND_ROOT_PATH_MODE_PACKAGE=ON            `
           -DXEUS_CPP_RESOURCE_DIR=${{ env.LLVM_BUILD_DIR }}/lib/clang/${{ matrix.clang-runtime }} `
-          -DSYSROOT_PATH=${{ env.SYSROOT_PATH }}     `                `
+          -DSYSROOT_PATH=${{ env.SYSROOT_PATH }}                `
           ..
         emmake make -j ${{ env.ncpus }} install