patch 8.0.0168: not all float functionality is tested

Problem:    Still some float functionality is not covered by tests.
Solution:   Add more tests. (Dominique Pelle, closes #1364)

src/version.c

@@ -764,6 +764,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    168,
 /**/
     167,
 /**/