patch 8.0.1170: using termdebug results in 100% CPU time

Problem:    Using termdebug results in 100% CPU time. (tomleb)
Solution:   Use polling instead of select().
diff --git a/src/version.c b/src/version.c
index 23859a1..d809ba9 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1170,
+/**/
     1169,
 /**/
     1168,