This reverts commit 8ff8d787.

Caused occasional crashes

Adapt bytecode DLL as a consequence.

Incidentally the new one takes far less time, especially on Octave.

The function is only called by Matlab if the statistics toolbox is not available.

(cherry picked from commit 48ee1364)

(cherry picked from commit bc962a91)

(cherry picked from commit 4a0b1c2e)

Now that the set_auxiliary_variables file is in a "+" directory, Octave fails
at str2func if the file does not exist.