Fix missing headers when compiling under mac 10.5

Why it worked without them, not sure.. They certainly should have been there to start with

Conflicts:

	mythtv/libs/libmythupnp/mmulticastsocketdevice.cpp

[cherry-picked from b522d60]

mythtv/libs/libmyth/mythcdrom-darwin.cpp

@@ -1,5 +1,6 @@
 #include <errno.h>
 #include <sys/fcntl.h>
+#include <unistd.h> // for close definition
 
 #include <IOKit/storage/IOCDMediaBSDClient.h>
 #include <IOKit/storage/IODVDMediaBSDClient.h>