patch 8.0.0857: terminal test fails on MS-Windows

Problem:    Terminal test fails on MS-Windows.
Solution:   Sleep a fraction of a second.
diff --git a/src/testdir/test_terminal.vim b/src/testdir/test_terminal.vim
index 987b1ee..3f5e268 100644
--- a/src/testdir/test_terminal.vim
+++ b/src/testdir/test_terminal.vim
@@ -152,6 +152,10 @@
   call term_wait(1234)
 
   call term_wait(buf)
+  if has('win32')
+    " TODO: this should not be needed
+    sleep 100m
+  endif
   call Check_123(buf)
 
   " Must still work after the job ended.