test channel: consider copying UDF for $VERSION as well

As discussed for the 4.2.1 release: it might make sense to also copy the UDF for $VERSION to the test channel.

I’ve used this:

for old_version in ${IUK_SOURCE_VERSIONS:?} ${VERSION:?}; do

which is slightly lighter on the eyes than the echo-based version (which I don’t think is required from a shell point of view).

Edited May 15, 2020 by Cyril 'kibi' Brulebois

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