Request 1007291: Submit gstreamer-plugins-vaapi

This request supersedes: request 1007226 (Show diff)

- Pass package-origin='http://download.opensuse.org' to meson.
- Drop unused ldconfig call from post(un), this is a plugin, not a
shared library.

- Pass package-origin='http://download.opensuse.org' to meson.
- Drop unused ldconfig call from post(un), this is a plugin, not a
shared library.

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Thanks.