dbGetPdbAddrFromLink dropped from 3.15 again

[Till Straumann <strauman@slac.stanford.edu>]

I'm running into the same issue that was discussed here:

https://epics.anl.gov/tech-talk/2017/msg01247.php

Michael's answer (https://epics.anl.gov/tech-talk/2017/msg01268.php)
recommends replacing subRecord by aSubRecord -- however, my use case
rather fits the first scenario mentioned by Michael: avoiding the 
overhead of dbGet()
What is the recommended migration path for this case?

I guess I could use

   dbGetNelements(const struct link*)
   dbGetLinkDBFtype(const struct link*)

to make sure the target of my link matches the expectations -- but there is
no way to access the data the link points to without either making a copy
(dbGet) or exploiting internals (which is deprecated/discouraged)

:-(

Like other posters I'm looking for a minimally intrusive (and yet 
'safe') solution
for a legacy system with not much horse-power.

- Till