build: impulse.h target calls recursive make about gbsplay HOT 3 OPEN

I'll try to remove the special handling and see what happens.
With all our build pipelines in place I think that if they pass, it's ok ;-)

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I added the recursive call in a429041:

Avoid running depend.sh before config.mk is included

Should fix:
   "./depend.sh: line 27: exec: : not found"
and also avoid the
  "fatal error: impulse.h: No such file or directory"
warning.

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I will have a deeper look into this:

• The config.mk recipe does no recursion, but I think it should - otherwise a freshly generated config.mk can't be picked up. How does this even work currently? ;-)
• I'll try to remove the generatedeps flag in the Makefile – the deps can also be handled by regular Makefile dependencies I think (my syndig does it that way)

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