[C++] conda_env_* files cannot be used to create a fresh conda environment on Windows

λ conda create -n arrow-dev python=3.7 --file=ci\conda_env_cpp.yml --file=ci\conda_env_python.yml -c conda-forge
Solving environment: failed                                                                                     
                                                                                                                
PackagesNotFoundError: The following packages are not available from current channels:                          
                                                                                                                
  - rsync                                                                                                       
  - nomkl                                                                                                       
                                                                                                                
Current channels:                                                                                               
                                                                                                                
  - https://conda.anaconda.org/conda-forge/win-64                                                               
  - https://conda.anaconda.org/conda-forge/noarch                                                               
  - https://repo.anaconda.com/pkgs/main/win-64                                                                  
  - https://repo.anaconda.com/pkgs/main/noarch                                                                  
  - https://repo.anaconda.com/pkgs/free/win-64                                                                  
  - https://repo.anaconda.com/pkgs/free/noarch                                                                  
  - https://repo.anaconda.com/pkgs/r/win-64                                                                     
  - https://repo.anaconda.com/pkgs/r/noarch                                                                     
  - https://repo.anaconda.com/pkgs/pro/win-64                                                                   
  - https://repo.anaconda.com/pkgs/pro/noarch                                                                   
  - https://repo.anaconda.com/pkgs/msys2/win-64                                                                 
  - https://repo.anaconda.com/pkgs/msys2/noarch                                                                 
                                                                                                                
To search for alternate channels that may provide the conda package you're                                      
looking for, navigate to                                                                                        
                                                                                                                
    https://anaconda.org                                                                                        
                                                                                                                
and use the search bar at the top of the page.