MFH: r408785 (only fixes, excluding the upgrade to latest upstream release)

multimedia/emby-server: Fix dependencies and improve pkg-msg

• Remove dependency on multimedia/libmediainfo (now uses FFMpeg instead)
• Add X11 OPTION (ON by default) for user to choose dependency of graphics/ImageMagick or graphics/ImageMagick-nox11
• Improve pkg-message to prompt the user to some additional options that can be set when building multimedia/ffmpeg and graphics/ImageMagick in order to optimise their Emby Server experience.

PR: 207155
Submitted by: woodsb02@gmail.com (maintainer)
Approved by: ports-secteam (feld)