patch 8.2.1114: terminal test sometimes times out

Problem:    Terminal test sometimes times out.
Solution:   Split the test in two parts.
diff --git a/src/testdir/Make_all.mak b/src/testdir/Make_all.mak
index fff4fdf..a0884cd 100644
--- a/src/testdir/Make_all.mak
+++ b/src/testdir/Make_all.mak
@@ -276,6 +276,7 @@
 	test_termcodes \
 	test_termencoding \
 	test_terminal \
+	test_terminal2 \
 	test_terminal_fail \
 	test_textformat \
 	test_textobjects \
@@ -492,6 +493,7 @@
 	test_termcodes.res \
 	test_termencoding.res \
 	test_terminal.res \
+	test_terminal2.res \
 	test_terminal_fail.res \
 	test_textformat.res \
 	test_textobjects.res \