meson: add gstreamer-full static support

Merged Stéphane Cerveau requested to merge dabrain34/gstreamer:dab_gst_full_static into main

Allow a project to use gstreamer-full as a static library and link to create a binary without gst dependencies.

To enable this feature, you need to pass these parameters to meson: -Ddefault_library=static -Dgst-full-target-type=static_library

$ meson buildfull-static -Ddefault_library=static -Dgst-full-target-type=static_library

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Edited by Stéphane Cerveau

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