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r198975 Thursday 19th October, 2023 at 18:47:15 UTC by Vasantha Crabb
Allow clone CHDs to use parent CHDs as parents.

* util/chd.cpp: Allow caller to provide a helper for finding parent CHDs
 and expose (recursive) missing parent status.
* emu/romload.cpp: Search parent systems/devices/software for parent
 CHDs on encountering a delta CHD.
* emu/romload.cpp: Report error on delta CHDs when parent can't be
 found.
* emu/romload.cpp: Check parents for matching CHDs with different names
 for devices as well as systems and software.
[src/emu]romload.cpp romload.h
[src/frontend/mame]audit.cpp
[src/lib/util]chd.cpp chd.h


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