Remove KDMAPI and MIDI device options for unsupported OSes

[MyBlackMIDIScore]

Fixes #89

Idk if there is a better way to do this. I feel likeI have added too many of those cfg flags but I couldn't think of another way rn

[Kaydax]

KDMAPI can work under BSD due to XSynth working under it, allowing for KDMAPI use with XSynth. It might also be possible to get OMv2 working under BSD, but I'm not sure.

[MyBlackMIDIScore]

I mean using XSynth through KDMAPI in Wasabi is pretty stupid since it is built in...
But if there are plans to support FBSD in OMv2 I guess we can modify the kdmapi-rs package to support that.
Although even then there will be other OSes that will fail to build KDMAPI if we just add support for FBSD, plus the restriction is needed for MIDI devices since midir doesn't support anything else except win, mac and linux