Prevent INVALID_SOCKET to be defined twice on linux (#1993)

i got an error because of this lol

src/extras/rnet.h

@@ -155,10 +155,6 @@ typedef int socklen_t;
     #include <arpa/inet.h>
 #endif
 
-#ifndef INVALID_SOCKET
-    #define INVALID_SOCKET ~(0)
-#endif
-
 #ifndef __USE_W32_SOCKETS
     #define closesocket close
     #define SOCKET int
@@ -166,6 +162,10 @@ typedef int socklen_t;
     #define SOCKET_ERROR -1
 #endif
 
+#ifndef INVALID_SOCKET
+    #define INVALID_SOCKET ~(0)
+#endif
+
 #ifdef __USE_W32_SOCKETS
     #ifndef EINTR
         #define EINTR WSAEINTR
@@ -2253,4 +2253,4 @@ uint64_t PacketRead64(Packet *packet)
     return value;
 }
 
-#endif  // RNET_IMPLEMENTATION
+#endif  // RNET_IMPLEMENTATION