We do this simply by omitting the content-type and let the browser
decide upon the mime-type of the sent file. Only exception is
'index.vnc', where we do set the content-type since some browsers
fail to detect it's html when it's ending in '.vnc'
Also, remove superfluous #defines. We close the connection always.
Expands the SetNonBlocking() function in libvncclient/sockets.c to also
work under Windows and also changes it to honour maybe already present
A similar function was introduced for libvncserver as well and
all the #ifdef'ed fnctl calls replaced with calls to that one.
Signed-off-by: Christian Beier <firstname.lastname@example.org>