This is consistent with stdio and is what we want to do in all cases. Fixes a bug in the voc muxer which didn't flush in write_trailer() previously. This is the cause of the change in the test results.
Signed-off-by: Justin Ruggles <justin.ruggles@gmail.com>
Signed-off-by: Kostya Shishkov <kostya.shishkov@gmail.com>