patch 9.1.0031: Link Error on Windows

Problem:  Link Error on Windows
Solution: Add ifdef HAVE_TGETENT for term_strings_not_set()

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index 8b19d81..4daa6e5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    31,
+/**/
     30,
 /**/
     29,