emulators/wine-devel: Allow choosing between OSS and ALSA

Our Wine ports have solely relied on OSS for sound so far. Add
support to optionally switch to ALSA by establishing two options,
OSS and ALSA.

This does not change default behavior (and packages created), rather
it adds the ability to choose. It particularly may prove beneficial
for USB MIDI keyboards.

Submitted by: hselasky
Approved by: damjan.jov@gmail.com (maintainer)