Update main.yml

Author: mcbarton

.github/workflows/main.yml

@@ -238,7 +238,7 @@ jobs:
           export PREFIX=$MAMBA_ROOT_PREFIX/envs/xeus-cpp-wasm-host
           echo "PREFIX=$PREFIX" >> $GITHUB_ENV
           export SYSROOT_PATH=$BUILD_PREFIX/opt/emsdk/upstream/emscripten/cache/sysroot
-          source $BUILD_PREFIX/opt/emsdk/emsdk_env.sh
+
           emcmake cmake \
             -DCMAKE_BUILD_TYPE=Release                        \
             -DCMAKE_INSTALL_PREFIX=$PREFIX                    \