- Add autodetection of installed versions to use if the user/port has not
expressed any preference (done using own WANT_WX framework by itself).
- Remove _WX_ILLEGAL_VERS_* added in the last update to 2.8. The reason is
that each port should choose the version it can use, that includes taking
into account available components (also this brings much more chicken and
egg problems so the code could get really messy).
- Correctly indent the first .for loop to initialize component information.
- Change dependency type separator from "_" to ":".
- Add WX_PREMK, WANT_UNICODE, WITHOUT_UNICODE, WXRC_CMD.
- Fix dependencies when using multiple components.
