btl/vader: silence warning

correctly check HAVE_SYS_PRCTL_H

opal/mca/btl/vader/btl_vader_component.c

@@ -16,6 +16,8 @@
  *                         All rights reserved.
  * Copyright (c) 2011      NVIDIA Corporation.  All rights reserved.
  * Copyright (c) 2014      Intel, Inc. All rights reserved.
+ * Copyright (c) 2014      Research Organization for Information Science
+ *                         and Technology (RIST). All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -38,7 +40,7 @@
 #include <sys/mman.h>
 #include <fcntl.h>
 
-#if HAVE_SYS_PRCTL_H
+#ifdef HAVE_SYS_PRCTL_H
 #include <sys/prctl.h>
 #endif