[klibc] add bzero()

bzero() contra memset() saves an argument,
which is about 4 bytes per call on x86.

"In fact, one could argue for making memset() an inline function which
collapses to bzero if the middle argument is zero." -hpa
left for a later exercise.

Signed-off-by: maximilian attems <max@stro.at>
3 files changed