Improve WOLFSSL_USER_IO defaults

IDE/WIN/user_settings.h

@@ -6,7 +6,14 @@
 #error This user_settings.h header is only designed for Windows
 #endif
 
+/* Optionally use custom IO, uncomment this line: */
+/* #define WOLFSSL_USER_IO */
+#ifdef WOLFSSL_USER_IO
+    #define WOLFSSL_NO_SOCK
+#else
     #define USE_WOLFSSL_IO
+#endif
+
 #define HAVE_AESGCM
 #define WOLFSSL_TLS13
 #define HAVE_HKDF

wolfssl/wolfcrypt/wc_port.h

@@ -1132,6 +1132,9 @@ WOLFSSL_ABI WOLFSSL_API int wolfCrypt_Cleanup(void);
         #endif
     #endif
     #ifndef SOCKET_INVALID
+        #ifndef INVALID_SOCKET
+            #define INVALID_SOCKET ((SOCKET_T)(-1))
+        #endif
         #define SOCKET_INVALID INVALID_SOCKET
     #endif
 #else