to support older iconv versions.

systems that prototype them slightly differently.

CURLOPT_NOBODY is set true. PREQUOTE is then run roughly at the same place
in the command sequence as it would have run if there would've been a
transfer.

on a persistent connection and allowed the first to use that header, you
could not disable it for the second request.

to multi_runsingle() without it being really necessary or good

timeout'ed connections and possibly deal with them too

HAVE_WINDOWS_H, HAVE_WINSOCK_H, HAVE_WINSOCK2_H, neither
HAVE_WS2TCPIP_H when __CYGWIN__ is defined.

fast treatment of many simultaneous transfers

not always zero!

used anymore since multi->num_alive was introduced