patch 8.0.0423: changing 'cinoptions' does not always work

Problem:    The effect of adding "#" to 'cinoptions' is not always removed.
            (David Briscoe)
Solution:   Reset b_ind_hash_comment. (Christian Brabandt, closes #1475)
diff --git a/src/Makefile b/src/Makefile
index 6e7fdde..f945322 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -2104,6 +2104,7 @@
 	test_channel \
 	test_charsearch \
 	test_changedtick \
+	test_cindent \
 	test_cmdline \
 	test_command_count \
 	test_crypt \