gst/matroska/: Disgustingly evil hack for working around INTERRUPT events and their extremely annoying habit of being...

Original commit message from CVS:
* gst/matroska/ebml-read.c: (gst_ebml_read_class_init),
(gst_ebml_read_init), (gst_ebml_read_use_event),
(gst_ebml_read_element_id), (gst_ebml_peek_id),
(gst_ebml_read_seek), (gst_ebml_read_skip),
(gst_ebml_read_reserve), (gst_ebml_read_buffer),
(gst_ebml_read_master):
* gst/matroska/ebml-read.h:
* gst/matroska/matroska-demux.c:
(gst_matroska_demux_parse_contents),
(gst_matroska_demux_loop_stream), (gst_matroska_demux_audio_caps):
Disgustingly evil hack for working around INTERRUPT events and
their extremely annoying habit of being a pain in the ass. We
simply peek a cluster before reading any of it.