[gobject-introspection] (4 commits) Non-fast-forward update to branch py38.windows

[Chun-wei Fan <fanchunwei src gnome org>]

The branch 'py38.windows' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  c00051a... Windows: Fix building and running on Python 3.8+
  80d5c03... test_scanner.py: Fix path tests on Windows

Commits added to the branch:

  ad937bc... Visual Studio builds: Use -utf-8 where available (*)
  d14923f... Windows: Fix building and running on Python 3.8+
  b24cddc... test_scanner.py: Fix path tests on Windows
  4d3289d... MSVC.README.rst: Add note about Python 3.8.x or later

(*) This commit already existed in another branch; no separate mail sent