w32api is being deprecated, explicit the value instead of using WindowsXP

src/top/starpu_top_connection.c

@@ -16,15 +16,11 @@
  */
 
 #ifdef __MINGW32__
-#  define WINVER WindowsXP
+#  define WINVER 0x0501 /* WindowsXP, for getaddrinfo */
 #endif
 
 #include <starpu_config.h>
 
-#ifdef __MINGW32__
-#  include <w32api.h>
-#endif
-
 #ifdef STARPU_HAVE_WINDOWS
 #  include <winsock2.h>
 #  include <ws2tcpip.h>