Fix ChangeLog typos.
        * config/avr/avr.opt (mlib=): New option.
        * config/avr/gen-avr-mmcu-specs.c (print_mcu): Output *self_spec.
        <*lib>: Add terminating double-newline.
        * config/avr/genmultilib.awk: Use -mlib=.
        * config/avr/t-multilib: Regenerate.
        * config/avr/gen-avr-mmcu-specs.c (print_mcu): Output sp8 as part
        of *self_spec, but don't repeat in *cc1/*cc1plus/*link.