vp8: Fix pthread_cond and pthread_mutex leaks

CC: libav-stable@libav.org

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
doc/platform: Remove part about dllimport

Only deprecated things need this at all anymore, as we have functions
to access them or they are no longer needed.

The document should not encourage use of deprecated APIs.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
Merge remote-tracking branch 'qatar/master'

* qatar/master:
  doc/platform: Remove part about dllimport
  vp8: Fix pthread_cond and pthread_mutex leaks

Conflicts:
	doc/platform.texi

Merged-by: Michael Niedermayer <michaelni@gmx.at>
fate/filter: use aperms to test volume filter.
lavfi/volume: use copy props helper instead of incomplete manual code.
lavfi/volume: use designated initializers for the sample_fmts declaration.
doc/filters: fix width/height typo in crop filter.

Signed-off-by: Clément Bœsch <ubitux@gmail.com>