Automatic update of common submodule

From 865aa20 to dbedaa0
adder: Release some request pads properly in the unit test
adder: Free consistency checker instance in test_live_seeking test
tagdemux: accumulate buffers in adapter

Accumulate buffers in an adapter instead of appending them because append causes
a lot of memcpys.
Keep track of the last tagsize and accumulate enough data before attempting to
parse more data.

This patch implements a minimal amount of changes in order to not change the
behaviour. We should really rewrite the tag handling and trimming using
the adapter API instead of merging and trimming into a buffer.