Undeclared dependency on rtpmanager in tests
meson test fails on
elements_rtpsink when gst-plugins-good is installed to a non-standard directory (but available on GST_SYSTEM_PLUGIN_PATH, etc), because
tests/check/meson.build does not make rtpmanager available.
The meson.build checks for
gst-plugins-base with pkg-config and adds them on
GST_PLUGIN_PATH_1_0. Something similar is needed for
gst-plugins-good, but it currently lacks a pkg-config file.