libintl.h: add _(x) and N_(x) and use it everywhere
remove _LIBC part from rpc headers
include libintl.h to rpc_private.h and use that instead of rpc.h
include libintl.h anywhere else needed replacing _(x) and N_(x)
Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>