patch 8.1.1097: Motif build fails

Problem:    Motif build fails. (Paul Jolly)
Solution:   Only use gui_mch_maximized() for MS-Windows. (closes #4194)
diff --git a/src/version.c b/src/version.c
index 792afea..846b816 100644
--- a/src/version.c
+++ b/src/version.c
@@ -772,6 +772,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1097,
+/**/
     1096,
 /**/
     1095,