patch 8.1.2246: some tests are still in old style

Problem:    Some tests are still in old style.
Solution:   Change a few tests to new style. (Yegappan Lakshmanan)
diff --git a/src/testdir/Make_all.mak b/src/testdir/Make_all.mak
index c22ce3b..f3906ac 100644
--- a/src/testdir/Make_all.mak
+++ b/src/testdir/Make_all.mak
@@ -267,6 +267,7 @@
 	test_textprop \
 	test_timers \
 	test_true_false \
+	test_trycatch \
 	test_undo \
 	test_unlet \
 	test_user_func \
@@ -433,6 +434,7 @@
 	test_textformat.res \
 	test_textobjects.res \
 	test_textprop.res \
+	test_trycatch.res \
 	test_undo.res \
 	test_user_func.res \
 	test_usercommands.res \