Improve place-holder record types

Heinz Junkes reported this:

make[1]: Entering directory '/home/epics/FHI/IOCVACUUM/IOCVACUUMApp/src/O.linux-x86_64'
Creating dbd file IOCVACUUM.dbd
perl -CSD /home/epics/BASE/epics-base/bin/linux-x86_64/dbdExpand.pl -I. -I.. -I../O.Common -I/srv/iocs/sys/vacuum/dbd -I/home/epics/SUPPORT/seq-2.2.6/dbd -I/home/epics/SUPPORT/asyn/dbd -I/home/epics/SUPPORT/calc/dbd -I/home/epics/SUPPORT/busy/dbd -I/home/epics/SUPPORT/autosave/dbd -I/home/epics/SUPPORT/iocStats/dbd -I/home/epics/SUPPORT/stream/dbd -I/home/epics/BASE/epics-base/dbd -o IOCVACUUM.dbd base.dbd drvAsynIPPort.dbd asyn.dbd stream.dbd calc.dbd busySupport.dbd devIocStats.dbd asSupport.dbd

Device using undefined record type 'scalcout', place-holder created
dbdExpand.pl: A different record type named 'scalcout' already exists
Context: recordtype(scalcout) in file '/home/epics/SUPPORT/calc/dbd/sCalcoutRecord.dbd' in file '/home/epics/SUPPORT/calc/dbd/calc.dbd'
  while reading 'calc.dbd' to create ‘IOCVACUUM.dbd'

dbdExpand.pl: Exiting due to errors

Mark Rivers diagnosed this:

I believe the problem is with the order of the dbd files. calc.dbd must come before stream.dbd because stream.dbd tries to use scalcout record.

It should be possible for a place-holder record type to be replaced with the full record type definition in this case, so this kind of mistake would still give the first "place-holder created" warning but add a note as to what the problem was and that it has been handled if/when the full record definition comes along later.