Do not compile socket IO code in WolfSSL

We use own IO callbacks from server code anyway.

extra/wolfssl/user_settings.h.in

@@ -13,6 +13,7 @@
 #define SESSION_CERT
 #define KEEP_OUR_CERT
 #define WOLFSSL_STATIC_RSA
+#define WOLFSSL_USER_IO
 #define WC_RSA_BLINDING
 #define HAVE_TLS_EXTENSIONS
 #define HAVE_AES_ECB

vio/viosocket.c

@@ -148,6 +148,10 @@ int vio_socket_io_wait(Vio *vio, enum enum_vio_io_event event)
 #define VIO_DONTWAIT 0
 #endif
 
+#ifndef SOCKET_EAGAIN
+#define SOCKET_EAGAIN SOCKET_EWOULDBLOCK
+#endif
+
 /*
   returns number of bytes read or -1 in case of an error
 */