patch 8.0.0792: spell test leaves files behind

Problem:    Spell test leaves files behind.
Solution:   Delete the files.
diff --git a/src/version.c b/src/version.c
index 350897b..3b45c94 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    792,
+/**/
     791,
 /**/
     790,