Only define __USE_XOPEN if not already defined.
In this part of the code it might now already be defined since
we enabled AC_USE_SYSTEM_EXTENSIONS.
Change-Id: I0651658d82550ee9be593d281bf50205815f9ef7
Reviewed-on: http://gerrit.openafs.org/1634
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>
#if defined(UKERNEL)
-#ifdef HAVE_UNISTD_H
+#if defined(HAVE_UNISTD_H) && !defined(__USE_XOPEN)
#define __USE_XOPEN
#endif
#include "afs/sysincludes.h"