Added post install script for pywin32 (#1748)

* Added post install script for pywin32

* Update command to python

* fix incorrect file extension

* trying pinned version of pywin

* Readding post script install

* Moved post install to install.sh

.circleci/unittest/windows/scripts/install.sh

@@ -18,9 +18,13 @@ conda activate ./env
 printf "* Installing PyTorch\n"
 conda install -y -c "pytorch-${UPLOAD_CHANNEL}" ${CONDA_CHANNEL_FLAGS} pytorch cpuonly
 
-printf "Installing torchdata nightly\n"
+printf "* Installing torchdata nightly\n"
 pip install --pre torchdata --extra-index-url https://download.pytorch.org/whl/nightly/cpu
 
+printf "* Installing pywin32_postinstall script\n"
+curl --output pywin32_postinstall.py https://raw.githubusercontent.com/mhammond/pywin32/main/pywin32_postinstall.py
+python pywin32_postinstall.py -install
+
 printf "* Installing torchtext\n"
 git submodule update --init --recursive
 "$root_dir/packaging/vc_env_helper.bat" python setup.py develop