more mkhybrid prototypes cleanups.
okay otto@

use sizeof (buf) instead of hardcoded value
use strcspn to properly overwrite '\n' in fgets returned buffer

ok ray@

mkhybrid 1.12b5.1

Note, this normally makes a "mkisofs" which is the same binary, mkisofs
from here needs to be tested out prior to replacing our existing mkisofs
with this. (currently just installs

mkhybrid 1.12b5.1

Note, this normally makes a "mkisofs" which is the same binary, mkisofs
from here needs to be tested out prior to replacing our existing mkisofs
with this. (currently just installs mkhybrid)

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