Fix missing prototype for _strdup

_strdup is not part of any include file i could find on Solaris 10.
manually add the _strdup prototype if needed.

cmr=v1.8.2:reviewer=jsquyres

This commit was SVN r32449.

opal/util/basename.c

@@ -10,6 +10,8 @@
  * Copyright (c) 2004-2005 The Regents of the University of California.
  *                         All rights reserved.
  * Copyright (c) 2009      Cisco Systems, Inc.  All rights reserved
+ * Copyright (c) 2014      Research Organization for Information Science
+ *                         and Technology (RIST). All rights reserved.
  * $COPYRIGHT$
  * 
  * Additional copyrights may follow
@@ -23,6 +25,9 @@
 #ifdef HAVE_STRING_H
 #include <string.h>
 #endif  /* HAVE_STRING_H */
+#ifdef HAVE__STRDUP
+char * _strdup (const char *);
+#endif /* HAVE__STRDUP */
 #ifdef HAVE_LIBGEN_H
 #include <libgen.h>
 #endif  /* HAVE_LIBGEN_H */