Fix DEBUG_XXXX_SUPPORT compile checks

code/espurna/debug.ino

@@ -9,7 +9,7 @@ Copyright (C) 2016-2017 by Xose Pérez <xose dot perez at gmail dot com>
 #include <stdio.h>
 #include <stdarg.h>
 
-#ifdef DEBUG_UDP_SUPPORT
+#if DEBUG_UDP_SUPPORT
 #include <WiFiUdp.h>
 WiFiUDP udpDebug;
 #endif
@@ -23,14 +23,14 @@ void debugSend(const char * format, ...) {
     int len = ets_vsnprintf(buffer, DEBUG_MESSAGE_MAX_LENGTH, format, args);
     va_end(args);
 
-    #ifdef DEBUG_SERIAL_SUPPORT
+    #if DEBUG_SERIAL_SUPPORT
         DEBUG_PORT.printf(buffer);
         if (len > DEBUG_MESSAGE_MAX_LENGTH) {
             DEBUG_PORT.printf(" (...)\n");
         }
     #endif
 
-    #ifdef DEBUG_UDP_SUPPORT
+    #if DEBUG_UDP_SUPPORT
         udpDebug.beginPacket(DEBUG_UDP_IP, DEBUG_UDP_PORT);
         udpDebug.write(buffer);
         if (len > DEBUG_MESSAGE_MAX_LENGTH) {
@@ -54,14 +54,14 @@ void debugSend_P(PGM_P format, ...) {
     int len = ets_vsnprintf(buffer, DEBUG_MESSAGE_MAX_LENGTH, f, args);
     va_end(args);
 
-    #ifdef DEBUG_SERIAL_SUPPORT
+    #if DEBUG_SERIAL_SUPPORT
         DEBUG_PORT.printf(buffer);
         if (len > DEBUG_MESSAGE_MAX_LENGTH) {
             DEBUG_PORT.printf(" (...)\n");
         }
     #endif
 
-    #ifdef DEBUG_UDP_SUPPORT
+    #if DEBUG_UDP_SUPPORT
         udpDebug.beginPacket(DEBUG_UDP_IP, DEBUG_UDP_PORT);
         udpDebug.write(buffer);
         if (len > DEBUG_MESSAGE_MAX_LENGTH) {

code/espurna/mqtt.ino

@@ -461,7 +461,7 @@ void mqttConfigure() {
 
 }
 
-#ifdef MDNS_SUPPORT
+#if MDNS_SUPPORT
 boolean mqttDiscover() {
 
     int count = MDNS.queryService("mqtt", "tcp");