fix: do not include RULES_SNCSEQ if not supported within configure

[jerzyjamroz]

This avoids the error on epics-base 7.0:

• sequencer/configure//RULES_SNCSEQ: No such file or directory

[ralphlange]

Hm...

Can you show how that error appears? I don't remember seeing it.

[jerzyjamroz]

@ralphlange , it happens straight away for other modules e.g. try to compile sscan with SNCSEQ := /epics-vanilla/base1/siteMods/sequencer then it cannot find the file.

[ralphlange]

Still puzzled. I have never seen this. Why doesn't it appear when building Base and modules on the Training VM?
E.g., in https://github.com/epics-training/training-vm/actions/runs/16068917725/job/45348905553

[jerzyjamroz]

I just glanced and it seems your build does not use sequencer/configure//RULES_SNCSEQ, which is correct, because it is in the cfg directory.

[ralphlange]

But aren't you saying you are seeing the problem with Base 7.0, even though under 7.0 it gets installed in and automatically included from cfg ??

I would really like to be able to reproduce this to understand what is happening and why.
Can you say for a minimal setup that shows the behavior - which modules in which versions do I need to clone and build in which order?