patch 8.1.2034: dark them of GTK 3 not supported

Problem:    Dark them of GTK 3 not supported.
Solution:   Add the "d" flag in 'guioptions'. (Jonathan Conder, closes #4934)
diff --git a/src/version.c b/src/version.c
index 9eb5db7..69c77d8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2034,
+/**/
     2033,
 /**/
     2032,