fate: aac: Add test for AAC-LD
fate: Increase the tolerance in the lavr tests

A few fate instances on OS/2, OpenBSD, FreeBSD and IA64 linux currently
still fail a few tests with a maxdiff of 6.

Signed-off-by: Martin Storsjö <martin@martin.st>
Merge commit 'f52fd3f3b26f0d80e4f0b374b7695383feca5b92'

* commit 'f52fd3f3b26f0d80e4f0b374b7695383feca5b92':
  fate: aac: Add test for AAC-LD

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge remote-tracking branch 'qatar/master'

* qatar/master:
  fate: Increase the tolerance in the lavr tests

Merged-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/hevcpred: fix make checkheaders.
HEVC Encoding via libx265

Obviously relies on Anton's HEVC patch set.
Revert "lavc/hevc: mark decoder as experimental"

This reverts commit f2dd45d06c606c41bcbf227ffc47e1ac0ce37d65.