their return value is no longer used, it's only confusing at this point.

instead of having a flag to discern between two different behaviours in S_SENDING, split that state into S_SENDING_FILE and S_SENDING_CGI (this will also make it easier in the future to add other sending states). While there, also get rid of `goodbye' and make start_reply advance the state machine by itself.

wc return 2048 on fedora (it doesn't count the trailing \n), while on OpenBSD, Void linux on aarch64 and Alpine linux on vmd(8) returns 2049.

libtls doesn't seem to return when doing blocking I/O, but libretls does every single time.

on fedora with libretls (running on top of openssl) it won't open the key otherwise.