Revert "vlc_block.h: Clarify usage of BLOCK_FLAG_DISCONTINUITY"
Revert "vlc_block.h: Clarify usage of BLOCK_FLAG_DISCONTINUITY"

This reverts commit de4be0a4505564a5f758f06edd74f49498107f6e.

xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc