VideoToolBox: replace hack that drops RASL by attaching kCMSampleBufferAttachmentKey_ResetDecoderBeforeDecoding in VideoToolbox
When there is time clean up this bit of code (https://git.videolan.org/?p=vlc.git;a=commitdiff;h=4997acdf9fedbc0b4588c9f16cb003407223aae4) with the following:
The way to inform the decoder that a seek just happened and that it should skip the RASL frames is to attach kCMSampleBufferAttachmentKey_ResetDecoderBeforeDecoding to the sample buffer holding the IRAP.