patch 8.1.2161: mapping test fails

Problem:    Mapping test fails.
Solution:   Run the test separately.

src/testdir/Make_all.mak

@@ -375,6 +375,7 @@ NEW_TESTS_RES = \
 	test_makeencoding.res \
 	test_man.res \
 	test_maparg.res \
+	test_mapping.res \
 	test_marks.res \
 	test_matchadd_conceal.res \
 	test_memory_usage.res \

src/testdir/test_alot.vim

@@ -38,7 +38,6 @@ source test_join.vim
 source test_jumps.vim
 source test_lambda.vim
 source test_lispwords.vim
-source test_mapping.vim
 source test_match.vim
 source test_menu.vim
 source test_messages.vim

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2161,
 /**/
     2160,
 /**/