The dependencies needed a little clean up as several dependencies are
only needed for the +X variant. This PR consolidates all of the
dependencies that actually require +X and explicitly disables them when
~X to prevent accidentally picking up system libraries.
- modified the description of the +X variant
- arranges dependencies to group them
- added missing dependency on xz
- removed unneeded dependencies
- freetype
- glib
- set dependencies when +X
- cairo
- jpeg
- libpng
- libtiff
- tcl/tk
- R uses tcl/tk together, so only tk needs to be depended on, and only
when +X
- moved tcl/tk resources to with/without-x test
- added explicit with/without settings for
- cairo
- jpeglib
- libpng
- libtiff
- tcltk
c11c5df738