alsa-gobject: add API to get current protocol version in each interface

[GitHub pull_request - opened]

alsa-project/alsa-gobject pull request #44 was opened from takaswie:

In UAPI of Linux sound subsystem, interfaces support protocol versioning. This patchset adds API to get current protocol version in each interface.

Request URL   : https://github.com/alsa-project/alsa-gobject/pull/44
Patch URL     : https://github.com/alsa-project/alsa-gobject/pull/44.patch
Repository URL: https://github.com/alsa-project/alsa-gobject