testing/gstreamermm: use glibmm2.66-dev instead of glibmm-dev
Resolve rebuild error on the edge builders due to Package 'giomm-2.4' not found
(volatile log).
configure: error: Package requirements (giomm-2.4 >= 2.47.6 gstreamer-1.0 >= 1.10.0 gstreamer-base-1.0 >= 1.10.0 gstreamer-check-1.0 >= 1.10.0 gstreamer-controller-1.0 >= 1.10.0 gstreamer-net-1.0 >= 1.10.0 gstreamer-allocators-1.0 >= 1.10.0 gstreamer-app-1.0 >= 1.10.0 gstreamer-audio-1.0 >= 1.10.0 gstreamer-fft-1.0 >= 1.10.0 gstreamer-pbutils-1.0 >= 1.10.0 gstreamer-plugins-base-1.0 >= 1.10.0 gstreamer-riff-1.0 >= 1.10.0 gstreamer-rtp-1.0 >= 1.10.0 gstreamer-rtsp-1.0 >= 1.10.0 gstreamer-sdp-1.0 >= 1.10.0 gstreamer-tag-1.0 >= 1.10.0 gstreamer-video-1.0 >= 1.10.0) were not met:
Package 'giomm-2.4' not found
Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.
Alternatively, you may set the environment variables GSTREAMERMM_CFLAGS
and GSTREAMERMM_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.
>>> ERROR: gstreamermm: build failed