GC old code that was originally implemented to facilitate adoption by
other BSDs, which never happened, so make things simpler for further
development.

Ditches config.h entirely since it gets reduce

GC old code that was originally implemented to facilitate adoption by
other BSDs, which never happened, so make things simpler for further
development.

Ditches config.h entirely since it gets reduced to 2 defines.

okay tb@

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better if I commit the version which actually includes the header ;)

somehow I forgot to add copyright and to include the right prototypes.
No actual code change (checked with cmp)

make the choice of engine explicit

simplify the running of .BEGIN/.END so that they pass through the engine
first (so they can now have dependencies). Error out properly if .BEGIN/.END
fails.