Retire the precompiled/ support
Retire the precompiled/ support

It was in a time long past that we tried to solve the problem Maven
solves so much more beautifully: avoiding the need to build everything
from scratch, but rather get trusted builds from a repository of
artifacts.

It is high time that we stop supporting that backwards-compatibility
wart.

Signed-off-by: Johannes Schindelin <53fb8db7833fca1e1746dd8592f61048d350f64c@gmx.de>

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