[DVDnav-discuss] multiple inclusion guards

[Diego Biurrun]

I want to propose adding proper multiple inclusion guards to both
libdvdread and libdvdnav, i.e.

#ifndef LIBDVDREAD_NAV_PRINT_H
#define LIBDVDREAD_NAV_PRINT_H

instead of

#ifndef NAV_PRINT_H_INCLUDED
#define NAV_PRINT_H_INCLUDED

I have already done this to my local trees, but attaching large patches
would be pointless.  OK to make the change?

Diego