patch 8.2.0215: wrong file name shortening

Problem:    Wrong file name shortening. (Ingo Karkat)
Solution:   Better check for path separator. (Yasuhiro Matsumoto,
            closes #5583, closes #5584)
diff --git a/src/version.c b/src/version.c
index 97584e3..20a6be4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    215,
+/**/
     214,
 /**/
     213,