games/REminiscence: update to REminiscence-0.5.1

Changelog:

* release 0.5.1
- added looping for DOS .prf music
- changed audio mixer to stereo
- updated timings for cutscenes

* release 0.5.0
- added CD-i widescreen mode (flashp*bob)
- added support for DOS .prf music (Adlib, MT32)

(yhardy)