message: winpack_dldt: switch defaults to OpenVINO 2020.4
diff: @@ -150,7 +150,7 @@ def git_apply_patch(src_dir, patch_file):
  patch_file = str(patch_file) # Python 3.5 may not handle Path
  assert os.path.exists(patch_file), patch_file
  execute(cmd=['git', 'apply', '--3way', '-v', '--ignore-space-change', str(patch_file)], cwd=src_dir)
  - execute(cmd=['git', 'diff', 'HEAD'], cwd=src_dir)
  + execute(cmd=['git', '--no-pager', 'diff', 'HEAD'], cwd=src_dir)
  #===================================================================================================
  @@ -443,8 +443,8 @@ class Builder:
  def main():
  dldt_src_url = 'https://github.com/openvinotoolkit/openvino'
  - dldt_src_commit = '2020.3.0'
  - dldt_release = '2020030000'
  + dldt_src_commit = '2020.4'
  + dldt_release = '2020040000'
  build_cache_dir_default = os.environ.get('BUILD_CACHE_DIR', '.build_cache')
  build_subst_drive = os.environ.get('BUILD_SUBST_DRIVE', None)
  