docs: add missing files for distribution

Fixes https://bugzilla.gnome.org/show_bug.cgi?id=720015

diff --git a/docs/design/Makefile.am b/docs/design/Makefile.am
index 7bd1746..94dece6 100644 (file)
--- a/docs/design/Makefile.am
+++ b/docs/design/Makefile.am
@@ -4,8 +4,14 @@ SUBDIRS =
 EXTRA_DIST = \
        design-audiosinks.txt      \
        design-decodebin.txt       \
-       design-encoding.txt       \
+       design-encoding.txt        \
        design-orc-integration.txt \
+       draft-hw-acceleration.txt  \
        draft-keyframe-force.txt   \
+       draft-subtitle-overlays.txt\
        draft-va.txt               \
+       part-interlaced-video.txt  \
+       part-mediatype-audio-raw.txt\
+       part-mediatype-text-raw.txt\
+       part-mediatype-video-raw.txt\
        part-playbin.txt