patch 8.1.1101: signals test may fail in the GUI

Problem:    Signals test may fail in the GUI.
Solution:   Skip the test for the GUI. (Yee Checng Chin, closes #4202)
diff --git a/src/version.c b/src/version.c
index bb112db..fe71128 100644
--- a/src/version.c
+++ b/src/version.c
@@ -772,6 +772,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1101,
+/**/
     1100,
 /**/
     1099,