lib/util_unistr.c: Removed ascii_to_unistr() as it does no codepage.

lib/util_unistr.c: Removed ascii_to_unistr() as it does no codepage.
					Removed unistr_to_ascii() as it was never used.
printing/nt_printing.c: Removed "DUMMY.XX" files.
rpc_server/srv_spoolss_nt.c: Use dos_PutUniCode() instead of ascii_to_unistr().
							Attempted to fix the "return value" size code based on J.F's
							comments. This needs looking at.
Jeremy.
(This used to be commit de99011bf3b2a23bd1854a047382a107aaeb9c68)