Added nextafter() test ported by Ananda Venkataraman.
diff --git a/runtest/math b/runtest/math
index 25d7320..02fb50a 100644
--- a/runtest/math
+++ b/runtest/math
@@ -10,3 +10,4 @@
 fptest02 fptest02
 fptest03 fptest03
 
+nextafter01 nextafter01