patch 8.2.0161: not recognizing .gv file as dot filetype

Problem:    Not recognizing .gv file as dot filetype.
Solution:   Add *.gv to dot pattern. (closes #5544)
diff --git a/src/version.c b/src/version.c
index 562b5fb..a87ca07 100644
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    161,
+/**/
     160,
 /**/
     159,