Removes unnecessary definitions for PS Vita and ensures unavailability of the Messages API.

unix.c

@@ -57,14 +57,9 @@
 #define HAS_GETNAMEINFO 1
 #endif
 #elif defined(__vita__)
-#ifdef HAS_POLL
-#undef HAS_POLL
-#endif
-#ifdef HAS_FCNTL
-#undef HAS_FCNTL
-#endif
-#ifdef HAS_IOCTL
-#undef HAS_IOCTL
+// PS Vita: No support for ancillary data or advanced message control
+#ifndef NO_MSGAPI
+#define NO_MSGAPI 1
 #endif
 #ifndef HAS_INET_PTON
 #define HAS_INET_PTON 1
@@ -72,9 +67,6 @@
 #ifndef HAS_INET_NTOP
 #define HAS_INET_NTOP 1
 #endif
-#ifdef HAS_MSGHDR_FLAGS
-#undef HAS_MSGHDR_FLAGS
-#endif
 #ifndef HAS_SOCKLEN_T
 #define HAS_SOCKLEN_T 1
 #endif
@@ -905,5 +897,4 @@ enet_socket_wait (ENetSocket socket, enet_uint32 * condition, enet_uint32 timeou
 #endif
 }
 
-#endif
-
+#endif