Fix Solaris build problem (jonas pointed out strerror_r is not available).

ndb/src/common/util/SocketServer.cpp:
  strerror_r is not available on all platforms. Use plain strerror.

ndb/src/common/util/SocketServer.cpp

@@ -123,11 +123,8 @@ SocketServer::setup(SocketServer::Service * service,
   /* Get the port we bound to */
   SOCKET_SIZE_TYPE sock_len = sizeof(servaddr);
   if(getsockname(sock,(struct sockaddr*)&servaddr,&sock_len)<0) {
-    char msg[100];
-    if(!strerror_r(errno,msg,sizeof(msg)))
-      strcpy(msg,"Unknown");
     ndbout_c("An error occurred while trying to find out what"
-	     " port we bound to. Error: %s",msg);
+	     " port we bound to. Error: %s",strerror(errno));
     NDB_CLOSE_SOCKET(sock);
     DBUG_RETURN(false);
   }