patch 8.1.1294: MS-Windows: Some fonts return wrong average char width

Problem:    MS-Windows: Some fonts return wrong average char width.
Solution:   Compute the average ourselves. (Ken Takata, closes #4356)
diff --git a/src/version.c b/src/version.c
index 21292fe..06a7a5f 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1294,
+/**/
     1293,
 /**/
     1292,