issue finding node.exe

Hey all,

I am getting intermittent issues not finding node.exe when I use the steps provided by the documentation.

```
emsdk/emsdk install latest
emsdk/emsdk activate latest
emsdk/emsdk_env.ps1
```
`make -C docs` result:

```
make: Entering directory 'C:/wm/DW-Hub/docs'
emcc src/main.cpp src/Device.cpp src/imgui_impl_glfw.cpp src/imgui_impl_opengl3.cpp src/imgui.cpp src/imgui_draw.cpp src/imgui_demo.cpp src/imgui_widgets.cpp src/imgui_tables.cpp src/yoga/Yoga.cpp src/yoga/YGValue.cpp src/yoga/YGStyle.cpp src/yoga/YGNodePrint.cpp src/yoga/YGNode.cpp src/yoga/YGLayout.cpp src/yoga/YGEnums.cpp src/yoga/YGConfig.cpp src/yoga/Utils.cpp src/yoga/log.cpp src/yoga/event/event.cpp src/yoga/internal/experiments.cpp -std=c++11 -o imgui.js -lGL -s USE_WEBGL2=1 -s USE_GLFW=3 -s FULL_ES3=1 -O2 --preload-file data -s WASM=1 -Isrc -Isrc/yoga
emcc: warning: cannot check node version: [WinError 2] The system cannot find the file specified [-Wversion-check]
shared:INFO: (Emscripten: Running sanity checks)
emcc: error: The configured node executable (['C:/wm/DW-Hub/emsdk/node/14.15.5_64bit/bin/node.exe']) does not seem to work, check the paths in C:\wm\DW-Hub\emsdk\.emscripten ([WinError 2] The system cannot find the file specified)
make: *** [Makefile:21: imgui.js] Error 1
make: Leaving directory 'C:/wm/DW-Hub/docs'
```