BUFSIZ is undefined in mpiext/affinity.h replace it with 1024 as it was prior

to 48a71c1

Signed-off-by: Aurelien Bouteiller <bouteill@icl.utk.edu>
(cherry picked from commit 6be8bfc)

Author: abouteiller

ompi/mpiext/affinity/c/mpiext_affinity_c.h

@@ -3,6 +3,9 @@
  *                         All rights reserved.
  * Copyright (c) 2010-2012 Cisco Systems, Inc.  All rights reserved.
  * Copyright (c) 2010      Oracle and/or its affiliates.  All rights reserved.
+ * Copyright (c) 2021      The University of Tennessee and the University
+ *                         of Tennessee research Foundation.  All rights
+ *                         reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -11,7 +14,7 @@
  *
  */
 
-#define OMPI_AFFINITY_STRING_MAX BUFSIZ
+#define OMPI_AFFINITY_STRING_MAX 1024
 
 typedef enum ompi_affinity_fmt {
     OMPI_AFFINITY_RSRC_STRING_FMT,