These two headers managed to avoid the global switch from
LGPL2.1 -> MIT back in the day, correct them to be aligned
with the rest of lws' own license, ie, MIT.
The %.*s is very handy to print strings where you have a length, but
there is no NUL termination. It's quite widely supported but at least
one vendor RTOS toolchain doesn't have it.
Since there aren't that many uses of it yet, audit all uses and
convert to a new helper lws_strnncpy() which uses the smaller of
two lengths.
