[osx/gtest] - fix linkage of xbmc-test binary (ffmpeg now needs expliciti linkage agaoinst framework VDA, and some new source files were missing in the makefiles)
[osx] - fix cmdline linkage of lixbmc.so and xbmc.bin - there is no circular dependency linker option on osx (e.x. -Wl,--start-group/--end-group) - so we still need to link in main.a for osx.
[fix] play from here in a DVD container folder only queue main file instead of all files
CFileItem - factor out determination of optical media math
[fix] Playback of a DVD as files in a folder should not create a playlist of those files
Merge pull request #3633 from Memphiz/cmdline

[osx] - fixed linkage of libxbmc.so, xbmc.bin and xbmc-test
Merge pull request #3644 from Voyager1/dvd-folder-nopl

Playback of a DVD as files in a folder should not create a playlist
Merge pull request #3686 from ace20022/fix_subs_auto_regr

[Fix][DVDPlayer] This fixes a regression introduced in 50a1d3c.
[Fix][Util] Allow any combination of flags, e.g., forced and default, for external subtitles.