patch 8.2.1793: not consistently giving the "is a directory" warning

Problem:    Not consistently giving the "is a directory" warning.
Solution:   Adjust check for illegal file name and directory. (Yasuhiro
            Matsumoto, closes #7067)
diff --git a/src/version.c b/src/version.c
index 33d39bd..beca185 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1793,
+/**/
     1792,
 /**/
     1791,