* conform/conformtest.pl (@headers): Add monetary.h-data,
mqueue.h-data, ndbm.h-data, nl_types.h-data, and poll.h-data.
* conform/data/monetary.h-data: New file.
* conform/data/mqueue.h-data: New file.
* conform/data/ndbm.h-data: New file.
* conform/data/nl_types.h.h-data: New file.
* conform/data/poll.h-data: New file.