alsa-gobject: seq/timer: add constructure for status object

alsa-project/alsa-gobject pull request #39 was opened from takaswie:

In patchset at #38, I forgot to add constructors for issued status object because no function call returns the instance of object. This patchset adds the constructors.

Request URL : https://github.com/alsa-project/alsa-gobject/pull/39 Patch URL : https://github.com/alsa-project/alsa-gobject/pull/39.patch Repository URL: https://github.com/alsa-project/alsa-gobject