patch 8.1.1975: MS-Windows GUI responds slowly to timer

Problem:    MS-Windows GUI responds slowly to timer.
Solution:   Break out of wait loop when timer was added or input is available.
            (closes #4893)

src/version.c

@@ -761,6 +761,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1975,
 /**/
     1974,
 /**/