Fix build breakage caused by the inclusion of <ddb/ddb.h> while building a module. Inclusion of option files (opt_ddb.h in this case) is not possible for modules. The inclusion of opt_ddb.h in this header is questionable.
Fix build breakage caused by the inclusion of <ddb/ddb.h> while
building a module. Inclusion of option files (opt_ddb.h in this
case) is not possible for modules. The inclusion of opt_ddb.h
in this header is questionable.

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