for some time now mandoc has not required MLINKS to function
correctly - logically complete that now by removing MLINKS from base;

authors need only to ensure there is an entry in NAME for any function/
util being added. MLINKS will still work, and remain for perl to ease
upgrades;

ok nicm (curses) bcook (ssl)
ok schwarze, who provided a lot of feedback and assistance
ok tb natano jung

Only build fdboot on the appropriate architectures. Also fix the path to
check-boot.pl so that it works with both boot and fdboot.

Build a 'fdboot' that will be used for floppy disk media. This can be made
smaller than the normal 'boot', however for now it is identical.

ok deraadt@