HEADS UP: extremely obsolete a.out build support removed, beware

[matthew green <mrg%eterna.com.au@localhost>]

hi folks.


i've removed the almost decade old support to build releases as a.out
from the tree.  there's a bunch more that can be done, but this is
probably the biggest commit and the most likely to break something
accidentaly.  i tested a bunch of platforms builds and actually running
the releases, as well as some binary comparision to ensure there were
no unintended changes.

please let me know or send-pr if there are any new problems.

thanks.


.mrg.