in rtph264depay.c, lines 577-576, NALU-type 24 (Single-Time Aggregation
Packet) is handled in fall-through as NALU-type 26 (unhandled).

This leads high quality h264 streams such as:

rtsp://stream.yle.mobi/yle/areena/MEDIA_E0342657_p3.mp4

to fail with "NAL unit type 24 not supported yet" (but it's actually
supported), and thus to close any stream which contains STAPs.

The proposed one-liner patch fixes the issue.
Fixes #615051.