reduce usage of DEBVER

Helmut Grohnerequested to merge
helmut into main

Johannes mentioned that while using DEBVER is convenient, it doesn't work too well with snapshot.d.n. This MR moves a bit of code (and branches) into customize-hooks and thus is able to defer the version detection to use the actual package versions installed.

Closes: #7 (closed)

Edited by Helmut Grohne

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