mednaffe: Update to 0.9.1

#### 04 / Feb /2021

Mednaffe 0.9.1 is released with the following changes:

- [Windows] Show correct icons in window buttons.
- [Windows] Changed Windows10 theme in order to fix most issues.
- [Windows] Add support for the guide button (XInput devices).
- [Linux] Lower version requirement of Autoconf to 2.69.

#### 28 / Jan / 2021

Mednaffe 0.9.0 is released with the following changes:

- Complete rewrite, dropping support for GTK2 and Windows XP.
- Almost all input options are included now.
- Added pce_fast and snes_faust modules.
- Added an option to show screenshots.
- Added the ability to send custom commands to emulator.
- Added a bios check widget.
- [Windows] Added an option to change themes.
- New logo & cosmetic changes.

(nia)