windows: Use mdns.h from deps/ folder

Instead of using a local copy, get the mdns.h file from the original
repository cloned into deps/ with "git subrepo".

Signed-off-by: Paul Cercueil <[email protected]>

Author: pcercuei

dns_sd_windows.c

@@ -18,7 +18,7 @@
 #include "dns_sd.h"
 #include "iio-lock.h"
 #include "iio-private.h"
-#include "mdns.h"
+#include "deps/mdns/mdns.h"
 
 #ifdef HAVE_IPV6
 static const unsigned char localhost[] = {