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)
diff --git a/src/version.c b/src/version.c
index 3f92271..191e101 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1975,
+/**/
     1974,
 /**/
     1973,