windows: Make sure dataclasses is included for 3.6 (#512)

Was failing upstream since we weren't installing the dependnecy

Signed-off-by: Eli Uriegas <[email protected]>

Author: seemethere

windows/build_pytorch.bat

@@ -56,7 +56,7 @@ FOR %%v IN (%DESIRED_PYTHON%) DO (
     set PYTHON_VERSION_STR=%%v
     set PYTHON_VERSION_STR=!PYTHON_VERSION_STR:.=!
     conda remove -n py!PYTHON_VERSION_STR! --all -y || rmdir %CONDA_HOME%\envs\py!PYTHON_VERSION_STR! /s
-    if "%%v" == "3.6" conda create -n py!PYTHON_VERSION_STR! -y -q numpy=1.11 "mkl>=2019" cffi pyyaml boto3 cmake ninja typing_extensions python=%%v
+    if "%%v" == "3.6" conda create -n py!PYTHON_VERSION_STR! -y -q numpy=1.11 "mkl>=2019" cffi pyyaml boto3 cmake ninja typing_extensions dataclasses python=%%v
     if "%%v" == "3.7" conda create -n py!PYTHON_VERSION_STR! -y -q numpy=1.11 "mkl>=2019" cffi pyyaml boto3 cmake ninja typing_extensions python=%%v
     if "%%v" == "3.8" conda create -n py!PYTHON_VERSION_STR! -y -q numpy=1.11 "mkl>=2019" pyyaml boto3 cmake ninja typing_extensions python=%%v
     if "%%v" == "3" conda create -n py!PYTHON_VERSION_STR! -y -q numpy=1.11 "mkl>=2019" pyyaml boto3 cmake ninja typing_extensions python=%%v