Extracting tarball on windows fails

[isuruf]

Actual Behavior

Fails with

Extracting download
Traceback (most recent call last):
  File "C:\Miniconda36-x64\lib\shutil.py", line 544, in move
    os.rename(src, real_dst)
FileNotFoundError: [WinError 2] The system cannot find the file specified: 'C:\\bld\\tmpishs5duj\\nauty26r7\\This_is_nauty26r7.' -> 'C:\\Users\\appveyor\\AppData\\Local\\Temp\\1\\tmpbh6znxkh\\This_is_nauty26r7.'

This works fine with conda-build 3.15.*

Expected Behavior

Extract the tarball correctly.

Steps to Reproduce

Add http://users.cecs.anu.edu.au/~bdm/nauty/nauty26r7.tar.gz as a source on windows and use conda-build>=3.16

Output of conda info

     active environment : base
    active env location : C:\Miniconda36-x64
            shell level : 1
       user config file : C:\Users\appveyor\.condarc
 populated config files : C:\Users\appveyor\.condarc
          conda version : 4.6.14
    conda-build version : 3.18.2
         python version : 3.6.5.final.0
       base environment : C:\Miniconda36-x64  (writable)
           channel URLs : 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/msys2/win-64
                          https://repo.anaconda.com/pkgs/msys2/noarch
          package cache : C:\Miniconda36-x64\pkgs
                          C:\Users\appveyor\.conda\pkgs
                          C:\Users\appveyor\AppData\Local\conda\conda\pkgs
       envs directories : C:\Miniconda36-x64\envs
                          C:\Users\appveyor\.conda\envs
                          C:\Users\appveyor\AppData\Local\conda\conda\envs
               platform : win-64
             user-agent : conda/4.6.14 requests/2.18.4 CPython/3.6.5 Windows/2012ServerR2 Windows/6.3.9600
          administrator : True
             netrc file : None
           offline mode : False
==> C:\Users\appveyor\.condarc <==
add_pip_as_python_dependency: False
auto_update_conda: False
channels:
  - conda-forge
  - defaults
show_channel_urls: True
==> envvars <==

[github-actions[bot]]

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