patch 8.0.1819: swap file warning for file with non-existing directory

Problem:    Swap file warning for a file in a non-existing directory, if there
            is another with the same file name. (Juergen Weigert)
Solution:   When expanding the file name fails compare the file names.
diff --git a/src/version.c b/src/version.c
index 5d85a80..a6fd36a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1819,
+/**/
     1818,
 /**/
     1817,