The user contacted me and said that py-sip dependency was missing.
Changes:
- Added the py-sip dependency (thanks to the user, Goran Mekić <meka@tilda.center>, for notifying me)
- Added USES=shebangfix because it is needed now
- Added CONFLICTS_BUILD=rtaudio-* rtmidi-* because it is bundled with incompatible versions of both packages and the build picks the preinstalled headers/libs first