server: Use kernel support for thread affinity when available.
diff --git a/configure.ac b/configure.ac
index d489f00..27ae652 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1692,6 +1692,7 @@
 	pwrite \
 	readdir \
 	readlink \
+	sched_setaffinity \
 	sched_yield \
 	select \
 	setproctitle \