fix some warnings

ChangeLog

@@ -1,4 +1,4 @@
-ENet 1.3.9 (August 18, 2013):
+ENet 1.3.9 (August 19, 2013):
 
 * added duplicatePeers option to ENetHost which can limit the number of peers from duplicate IPs
 * added enet_socket_get_option() and ENET_SOCKOPT_ERROR

include/enet/enet.h

@@ -71,13 +71,9 @@ typedef enum _ENetSocketShutdown
     ENET_SOCKET_SHUTDOWN_READ_WRITE = 2
 } ENetSocketShutdown;
 
-enum
-{
-   ENET_HOST_ANY       = 0,            /**< specifies the default server host */
-   ENET_HOST_BROADCAST = 0xFFFFFFFF,   /**< specifies a subnet-wide broadcast */
-
-   ENET_PORT_ANY       = 0             /**< specifies that a port should be automatically chosen */
-};
+#define ENET_HOST_ANY       0
+#define ENET_HOST_BROADCAST 0xFFFFFFFFU
+#define ENET_PORT_ANY       0
 
 /**
  * Portable internet address structure. 

include/enet/unix.h

@@ -18,10 +18,7 @@
 
 typedef int ENetSocket;
 
-enum
-{
-    ENET_SOCKET_NULL = -1
-};
+#define ENET_SOCKET_NULL -1
 
 #define ENET_HOST_TO_NET_16(value) (htons (value)) /**< macro that converts host to net byte-order of a 16-bit value */
 #define ENET_HOST_TO_NET_32(value) (htonl (value)) /**< macro that converts host to net byte-order of a 32-bit value */

include/enet/win32.h

@@ -19,10 +19,7 @@
 
 typedef SOCKET ENetSocket;
 
-enum
-{
-    ENET_SOCKET_NULL = INVALID_SOCKET
-};
+#define ENET_SOCKET_NULL INVALID_SOCKET
 
 #define ENET_HOST_TO_NET_16(value) (htons (value))
 #define ENET_HOST_TO_NET_32(value) (htonl (value))