patch 8.1.0710: when using timers may wait for job exit quite long

Problem:    When using timers may wait for job exit quite long.
Solution:   Return from ui_wait_for_chars_or_timer() when a job or channel
            needs to be handled. (Ozaki Kiichi, closes #3783)
diff --git a/src/version.c b/src/version.c
index e1ea65e..f0e4450 100644
--- a/src/version.c
+++ b/src/version.c
@@ -800,6 +800,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    710,
+/**/
     709,
 /**/
     708,