is updated even if everything is read in one single pass, as the windows
functions apparantly does more often than other systems.

Really, we should only #define this in one file, not both here and in
connect.c!

add 'headers=' in client formpost

Reminder for the future: when we're using malloc() we MUST include <stdlib.h>
as otherwise 64bit archs go bananas.

Bug report #517687

was an extra CRLF added to the post data