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

query_classifier/query_classifier.h

@@ -18,6 +18,7 @@ Copyright MariaDB Corporation Ab
 */
 
 /** getpid */
+#include <my_config.h>
 #include <unistd.h>
 #include <mysql.h>
 #include <skygw_utils.h>

query_classifier/test/canonical_tests/canonizer.c

@@ -1,3 +1,4 @@
+#include <my_config.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>

query_classifier/test/classify.c

@@ -1,3 +1,4 @@
+#include <my_config.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>