IS_WSL detect if running under WSL

Detects if Matlab is installed and running from within Windows Subsystem for Linux

function w = is_wsl()

w = 0;

if isunix() && ~ismac()
  fid = fopen('/proc/version');
  if fid >= 1
    v = fscanf(fid, '%s');
    fclose(fid);
    if endsWith(v, "microsoft-standard-WSL2")
      w = 2;
    elseif endsWith(v, "-Microsoft")
      w = 1;
    end
  end
end

mustBeInteger(w)

end