Included the my_config.h header before any system headers if mysql headers were used.

server/core/config.c

@@ -41,6 +41,7 @@
  *
  * @endverbatim
  */
+#include <my_config.h>
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>

server/core/gateway.c

@@ -40,6 +40,7 @@
  * @endverbatim
  */
 #define _XOPEN_SOURCE 700
+#include <my_config.h>
 #include <ftw.h>
 #include <string.h>
 #include <strings.h>

server/core/poll.c

@@ -15,6 +15,7 @@
  *
  * Copyright MariaDB Corporation Ab 2013-2014
  */
+#include <my_config.h>
 #include <stdio.h>
 #include <string.h>
 #include <unistd.h>