Recent pcm/ac97 commit breaks all the glass in my house

[Orion Hodson]

/-- John Baldwin wrote:
| 
| Ok, it seems that the following change is sufficient:
| 
| +#if 0
|         /* use igain for the mic 20dB boost */
|         [SOUND_MIXER_IGAIN]     = { -AC97_MIX_MIC,      1, 6, 0, 0, 0, 1, 1 }
| ,
| +#endif
| 
| I tried playing with mixer igain (which defaulted to 0), but turning
| it up just made things a lot worse.

Okay, I'm happy for this to be committed.  If you want to commit this now, that'd be great.
- Orion