patch 8.0.0614: float2nr() is not exactly right

Problem:    float2nr() is not exactly right.
Solution:   Make float2nr() more accurate.  Turn test64 into a new style test.
            (Hirohito Higashi, closes #1688)
diff --git a/src/testdir/Make_vms.mms b/src/testdir/Make_vms.mms
index 4888b17..b0c26aa 100644
--- a/src/testdir/Make_vms.mms
+++ b/src/testdir/Make_vms.mms
@@ -87,7 +87,7 @@
        test43.out test44.out test45.out \
        test48.out test49.out test51.out test53.out test54.out \
        test55.out test56.out test57.out test60.out \
-       test64.out test65.out \
+       test64.out \
        test66.out test67.out test68.out test69.out \
        test72.out test75.out \
        test77a.out test78.out test79.out test80.out \