patch 8.1.2199: build failure when using normal features without GUI

Problem:    Build failure when using normal features without GUI and EXITFREE
            defined.
Solution:   Add #ifdef. (Dominique Pelle, closes #5106)
diff --git a/src/version.c b/src/version.c
index 77e6e35..f6e0b76 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2199,
+/**/
     2198,
 /**/
     2197,