Attempt to fix wasm build

Author: mcbarton

.github/workflows/main.yml

@@ -228,7 +228,7 @@ jobs:
             -DXEUS_CPP_EMSCRIPTEN_WASM_BUILD=ON               \
             -DCMAKE_FIND_ROOT_PATH_MODE_PACKAGE=ON            \
             ..
-          EMCC_CFLAGS='-sERROR_ON_UNDEFINED_SYMBOLS=0' emmake make -j  ${{ env.ncpus }}
+          emmake make -j  ${{ env.ncpus }}
 
       - name: Setup tmate session
         if: ${{ failure() && runner.debug }}