gst-uninstalled: add gst-rtsp-server bits and break up overly long lines
Add some of the bits needed for an uninstalled gst-rtsp-server (so gdb works on the examples etc.). Python bits are still missing, and we might need an -uninstalled.pc file as well in the future. Break up very long lines to make them easier to read and maintain. Also remove gst-plugins paths from the old days.