Blu-Ray playback

[RJVB (René Bertin)]

I'm in the process of improving Blu-Ray playback support, ultimately in VLC but the main work is being done in libbluray and libaacs. I thought it'd be OK if not better to create a single enhancement ticket for this, attaching multiple diffs.

The changes to port:libbdplus and port:libbluray have probably stabilised:

port:libbdplus

• add an explicit depspec for libaacs to avoid opportunistic dependencies

• remove the obsolete --disable-examples configure argument
• fix the livecheck regex

port:libbluray

• upgrade to 1.0.1 (not yet mentioned on the homepage!)
• fix the livecheck regex
• add ${prefix}/lib to the internal dlopen search path
• remove obsolute --enable-udf option and enable building the example (the bd_info utility)
• add a +bdjava variant which is required for supporting java-based menus in VLC

The latter was a bit tricky: building the variant requires having a JDK installed (AFAIK only Oracle provides a working one for Mac). Just running would of course work with a JRE but there's a catch-22 there. The only JRE I know of (JavaAppletPlugin) is also provided by Oracle. I'd love to propose making +bdjava the default because why install this port if you're not interested in Blu-Ray playback. But that would require raising an error if that JavaAppletPlugin isn't installed (the build will fail out of itself if no JDK is installed).