Meson: Avoid using add_global_arguments() when gst-build is a subproject
Meson only allows the main project to use it. We already set that flag in all GStreamer modules just like warning flags.
Fixes: #152 (closed)
Meson only allows the main project to use it. We already set that flag in all GStreamer modules just like warning flags.
Fixes: #152 (closed)