with -I for example

make a different and more complicated check for when to include it

server and things

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