Fix AirTunes pts accuracy
Revert broken part of [6f653c5a2ba30008d62ab589ff5686df8a29ef72].

This was obviously untested as it breaks external ffmpeg build and only changes this code path.
xbmc/cores/dvdplayer/DVDDemuxers/DVDDemuxers.a(DVDDemuxFFmpeg.o): In function `DllAvFormat::av_read_frame_flush(AVFormatContext*):
/home/alexis/xbmc/lib/DllAvFormat.h:121: undefined reference to
`ff_read_frame_flush'

Even if it did not break, the change is wrong anyway.
Merge pull request #2625 from hmis/AirTunes_pts

Fix AirTunes pts accuracy
Rename our local copy of av_read_frame_flush to xbmc_read_frame_flush as suggested by elupus on PR2633.

That way it makes it clear the function is from xmbc and not ffmpeg.
[libdvd] - added missing patches
[Fix] http protocol options seekable=0 now finally works.
Merge pull request #2644 from ulion/fix_seekable_protocol_option

[Fix] http protocol options seekable=0 now finally works.
GUIFadeLabelControl: fix control being marked as dirty when label stays empty

If used infolabel will return empty string on first use, m_shortText will never be evaluated. If m_shortText is set to false control is marked as dirty so if used infolabel is empty control will be wrongly marked as dirty.
FIX: log spamming
correct date formats. fixes #14286
Typo fix in README.raspberrypi
Merge pull request #2650 from robinbijlani/patch-1

Typo fix in README.raspberrypi
Merge pull request #2646 from koying/fixlogspamming

FIX: log spamming
[Cosmetic] Fix indentation.
[LangCodeExpander] Add "Abkhaz" to the ISO 639-2 list.
[LangCodeExpander] Fix German and Portuguese ISO 639-1 language code and add "Abkhaz".
Merge pull request #2651 from ace20022/lang_codes

Fix and extend ISO 639 lists
FIX: Allow "Scan for new content" on folders
Merge pull request #2645 from koying/fixscanfolder

FIX: Allow "Scan for new content" on folders
Merge pull request #2633 from aballier/mess

Revert broken part of [6f653c5a2ba30008d62ab589ff5686df8a29ef72].