patch 8.2.3543: swapname has double slash when 'directory' ends in it

Problem:    Swapname has double slash when 'directory' ends in double slash.
            (Shane Smith)
Solution:   Remove the superfluous slash. (closes #8876)
diff --git a/src/version.c b/src/version.c
index f449532..c3f1fd6 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3543,
+/**/
     3542,
 /**/
     3541,