Rockbox

Tried to send this to the dev list, but it seems not to have gone through:

I downloaded the daily build of Rockbox yesterday for my video ipod. Today I decided to recompile without the audio recording features (I don't have a mic on this ipod). When I commented out the line defining HAVE_RECORDING, it wouldn't compile without the attached patch because SOUND_LEFT_GAIN, SOUND_RIGHT_GAIN and SOUND_MIC_GAIN only get defined in firmware/export/audiohw.h if HAVE_RECORDING is defined. In order for HAVE_RECORDING to work properly, that value needs to be tested in wm8758.c as it is in, say, wm8731.c.

I haven't gotten very deep in the code, but casual inspection suggests as3514.c and other some others might suffer from the same defect. The one file patched below was the only one I needed to change for this target.