[libmicrohttpd] Please update demo flags

[silvioprog]

Hello masters,

I noticed some flags was renamed on new MHD versions, so it would be nice
to upgrade all examples (including commented sources) to using that new
flags, for example (it seems all in red was renamed):

#if 0
  (void) MHD_add_response_header (response,
              MHD_HTTP_HEADER_CONNECTION,
              "close");
#endif
  d = MHD_start_daemon (MHD_USE_INTERNAL_POLLING_THREAD |
MHD_USE_SUPPRESS_DATE_NO_CLOCK
#ifdef EPOLL_SUPPORT
         | MHD_USE_EPOLL | MHD_USE_TURBO
#endif


Thank you!

-- 
Silvio Clécio