Bug#902654: larry6: Add support for SVGA version

[Roma Tentser]

I've tried the game on different system (stretch + git g-d-p + buster 
scummvm & innoextract). There was some strange output in terminal:

WARNING: SDL mixer output buffer size: 512 differs from desired: 1024!
User picked target 'lsl6hires' (gameid 'lsl6hires')...
   Looking for a plugin supporting this gameid... SCI [SCI0, SCI01, 
SCI10, SCI11, SCI32]
   Starting 'Leisure Suit Larry 6: Shape Up or Slip Out!'
ALSA lib seq_hw.c:466:(snd_seq_hw_open) open /dev/snd/seq failed: No 
such file or directory
ALSA lib seq_hw.c:466:(snd_seq_hw_open) open /dev/snd/seq failed: No 
such file or directory
ALSA lib seq_hw.c:466:(snd_seq_hw_open) open /dev/snd/seq failed: No 
such file or directory
ALSA lib seq_hw.c:466:(snd_seq_hw_open) open /dev/snd/seq failed: No 
such file or directory
ALSA lib seq_hw.c:466:(snd_seq_hw_open) open /dev/snd/seq failed: No 
such file or directory
ALSA lib seq_hw.c:466:(snd_seq_hw_open) open /dev/snd/seq failed: No 
such file or directory
ALSA lib seq_hw.c:466:(snd_seq_hw_open) open /dev/snd/seq failed: No 
such file or directory
ALSA lib seq_hw.c:466:(snd_seq_hw_open) open /dev/snd/seq failed: No 
such file or directory
ALSA lib seq_hw.c:466:(snd_seq_hw_open) open /dev/snd/seq failed: No 
such file or directory
ALSA lib seq_hw.c:466:(snd_seq_hw_open) open /dev/snd/seq failed: No 
such file or directory

But the game, menu entry & menu command work so i don't think it's a 
g-d-p's problem. I believe it was a strange glitch of buster that i 
can't reproduce.