GitLab

Add hostname(1) implementation

See merge request !1

Thanks to floatcomplex.

This isn't exactly compatible with net-tools, but it is close.
net-tools will buffer a line longer than 1024 characters (up to the next
63 characters).  This implementation will break at the 1024th character
and start a new block of 63 char names there.

I sincerely hope nobody is actually using this weird, undefined
behaviour for anything serious.

This allows us to have a correct, variable NAME_MAX (and others).