transcode: general cleanup needed

[dbevans (David B. Evans)]

transcode: general port cleanup as follows:

• update master_sites to point at new berlios.de support site
• remove unnecessary pre-configure autoreconf step and related dependencies as we are not universal yet
• add build dependency on pkgconfig
• add X11 dependencies
• enable altivec optimizations for ppc platforms (tested ok)
• add +mmx variant to enable testing of mmx optimizations on Intel platforms
• add +full variant which enables all supported optional components
• remove --enable-a52-default-decoder configure option which is no longer supported
• remove +faad variant which is no longer supported
• add +libpostproc variant to enable libpostproc support from ffmpeg
• add +mjpegtools variant to enable mjpegtools support
• add +experimental and +deprecated variants to support corresponding configure options. Not included in +full as these should be used with caution.
• add +no_x11 variant to disable X11 support in non-X11 environments
• update livecheck to work with new berlios.de support site

[dbevans (David B. Evans)]

Committed in r47681.

[(none)]

Milestone Port Bugs deleted