demux: remove some useless boilerplate
xcb: simplify build rules
directsound: cosmetic rename
Fix CDDA build with CDDB
Fix libass linking that always need freetype
Fix quicktime module link
DirectSound: decrease a bit the volume

This should make 100% 3dB lower

Should close #9371
vda: user ref buffer mode

This fixes memory leaks when seeking or dropping frames for other reasons.

close #8927
Unbreak libtwolame compilation
Fix skins2 build
xiph: handle mixed case comments.

Lowercase or mixed case identifier are legit.
reverts 03c69b44b3ddb9971f34ea4e9bfacc0e23a23a23
xiph: set limit to chapters.

Limits memory size allocation that could have been triggered by
a file, due to chapters array for reordering.
demux: ogg: don't try seeking using bitrate if incomplete.

Results in wrong position if only one track has bitrate info.
Fix po distcheck

Changing a file name requires this change, usually...
Contribs: update ORC
Contribs: update zvbi
x265 encoder
Contribs: update gnutls to 3.1.14