Move @file comment

Where it exists, the @file comment has now been moved to be
consistently right after the license blurb.

include/maxscale/protocol/mysql.h

@@ -36,6 +36,7 @@
  *
  */
 
+#include <maxscale/cdefs.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdint.h>
@@ -65,6 +66,8 @@
 #include <maxscale/gw.h>
 #include <mysql.h>
 
+MXS_BEGIN_DECLS
+
 #define GW_MYSQL_VERSION "5.5.5-10.0.0 " MAXSCALE_VERSION "-maxscale"
 #define GW_MYSQL_LOOP_TIMEOUT 300000000
 #define GW_MYSQL_READ 0
@@ -373,4 +376,6 @@ int mxs_mysql_send_ok(DCB *dcb, int sequence, int affected_rows, const char* mes
 /** Check for OK packet */
 bool mxs_mysql_is_ok_packet(GWBUF *buffer);
 
+MXS_END_DECLS
+
 #endif /** _MYSQL_PROTOCOL_H */