fix path on windows

Author: blink1073

.evergreen/scripts/install-dependencies.sh

@@ -18,6 +18,9 @@ function _pip_install() {
   _HERE=$(dirname ${BASH_SOURCE:-$0})
   . $_HERE/../utils.sh
   _VENV_PATH=$(mktemp -d)
+  if [ "Windows_NT" = "${OS:-}" ]; then
+    _VENV_PATH=$(cygpath -m $_VENV_PATH)
+  fi
   echo "Installing $2 using pip..."
   createvirtualenv "$(find_python3)" $_VENV_PATH
   python -m pip install $1